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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.
2
1, 1, 6, 71, 1433, 44443, 1968580, 118159971, 9240555677, 913352224942, 111374887418013, 16428282185046946, 2883740893056526715, 594152447495864629867, 142006380268368661423424, 38973735372090120549251580, 12174162204364698538764222978, 4294569227671480526607187583713
(list; graph; refs; listen; history; text; internal format)
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

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Last modified November 7 00:48 EST 2024. Contains 377523 sequences.
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