A357602 a(n) is the number of n-gons in A000940 that are asymmetric.

0, 0, 0, 1, 15, 121, 1026, 8696, 81515, 827282, 9200052

Offset

3,5

Links

Table of n, a(n) for n=3..13.

Formula

a(n) = A000940(n) - A342533(n).

a(p) = ((((p-1)! + 1)/p) + p - 2 - (2^((p-1)/2)*((p-1)/2)!))/4 for prime p. See A007619.

Example

Of the A000940(6) = 12 hexagons, 11 have symmetry and 1 is asymmetric, so a(6)=1.

Crossrefs

Cf. A000940, A342533.

Sequence in context: A081079 A138424 A279267 * A120794 A264377 A038743

Adjacent sequences: A357599 A357600 A357601 * A357603 A357604 A357605

Keyword

nonn,more

Author

Ian Mooney, Oct 05 2022

Status

approved