A357141 Number of n X n triangular matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to 2n.

1, 1, 6, 71, 1433, 44443, 1968580, 118159971, 9240555677, 913352224942, 111374887418013, 16428282185046946, 2883740893056526715, 594152447495864629867, 142006380268368661423424, 38973735372090120549251580, 12174162204364698538764222978, 4294569227671480526607187583713

Offset

0,3

Links

Table of n, a(n) for n=0..17.

Formula

a(n) = A137251(2n,n).

Crossrefs

Cf. A137251.

Sequence in context: A218676 A127135 A187651 * A005981 A024272 A167813

Adjacent sequences: A357138 A357139 A357140 * A357142 A357143 A357144

Keyword

nonn

Author

Alois P. Heinz, Sep 14 2022

Status

approved