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 A331645 Number of nonnegative integer matrices with n columns and any number of distinct nonzero rows with column sums 3. 5
 1, 3, 87, 11655, 4498191, 3611504823, 5192498314767, 12172382140406295, 43436006002867938351, 224018914608150321575223, 1603777845822934662938327247, 15430102163147097295950086754135, 194280602846166109497542618768659311, 3131120528310366432743101620841328437623 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 0..100 EXAMPLE The a(1) = 3 matrices are:    [2]  [1]  [3]    [1]  [2] CROSSREFS Row n=3 of A331568. Cf. A331644. Sequence in context: A230670 A232069 A172723 * A037112 A093748 A156737 Adjacent sequences:  A331642 A331643 A331644 * A331646 A331647 A331648 KEYWORD nonn AUTHOR Andrew Howroyd, Jan 23 2020 STATUS approved

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Last modified December 9 09:37 EST 2021. Contains 349627 sequences. (Running on oeis4.)