A038019 Triangle: T(n,k), k<=n: groupoids with no symmetry with n elements and k idempotents.

1, 0, 1, 1, 4, 1, 969, 1431, 729, 108, 56615456, 75491208, 37741600, 8386560, 697501

Offset

0,5

Links

Table of n, a(n) for n=0..14.

Index entries for sequences related to groupoids

Crossrefs

Cf. A001329, A030248, A030251, A030271.

Sequence in context: A240098 A094337 A345313 * A164804 A036115 A056582

Adjacent sequences: A038016 A038017 A038018 * A038020 A038021 A038022

Keyword

nonn,tabl,more

Author

Christian G. Bower, May 15 1998

Status

approved