A357602 - OEIS

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

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OFFSET

3,5

LINKS

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

KEYWORD

nonn,more

AUTHOR

Ian Mooney, Oct 05 2022

STATUS

approved