Contributions to the
Online Encyclopedia of Integer Sequences (OEIS)
1. A345317
Number of transitive but not symmetric relations on an n-set
Published Online on October 2, 2021
2. A348137
Number of transitive relations involving all the elements of an n-set
Published Online on October 2, 2021
3. A348151
First differences of A006905
Published Online on October 3, 2021
4. A349848
a(n) = Sum_{k=1..n} prime(n)^prime(k)
Published Online on December 2, 2021
5. A349919
Number of transitive relations on an n-set with exactly two ordered pairs
Published Online on December 5, 2021
6. A349927
Number of transitive relations on an n-set with exactly three ordered pairs
Published Online on December 5, 2021
7. A349849
Number of transitive relations on an n-set with exactly four ordered pairs
Published Online on December 6, 2021
8. A348634
Number of transitive relations on an n-set with exactly five ordered pairs
Published Online on December 13, 2021
9. A350159
Number of subgroups of the dicyclic group Dic_n
Published Online on December 17, 2021
10. A353179
a(n) is the first nonzero digit in the decimal expansion of 1/prime(n)
Published Online on April 29, 2022