A374773 a(n):= #G_{2n}(3n+1) for n >= 1, where G_{2n}(3n+1) is the set of all pure (2n)-sparse gapset of genus 3n+1 and n a positive integer.

3, 8, 22, 54, 135, 331, 808

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Gilberto B. Almeida Filho and Matheus Bernardini On pure kappa-sparse gapsets, Semigroup Forum, Vol. 104 (2022), pp. 213-227.

Gilberto Brito and Stéfani Vieira, A certain sequence on pure kappa-sparse gapsets, arXiv:2407.21563 [math.CO], 2024. See pp. 1-2.

Crossrefs

Cf. A348619.

Sequence in context: A027235 A086596 A036882 * A020962 A027243 A110239

Adjacent sequences: A374770 A374771 A374772 * A374774 A374775 A374776

Keyword

nonn,hard,more

Author

Gilberto Brito de Almeida, Jul 19 2024

Status

approved