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 A331344 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with each column sum being 3 and rows in decreasing lexicographic order. 2
 1, 2, 15, 317, 12586, 803764, 75603729, 9880078404, 1719511013708, 385900586669488, 108870763685147631, 37821200661333033093, 15903952714275755480410, 7978911737260660423782839, 4717171385049289138016854041, 3251403192784472823846341645000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The condition that the rows be in decreasing order is equivalent to considering nonequivalent matrices with distinct rows up to permutation of rows. LINKS Andrew Howroyd, Table of n, a(n) for n = 0..100 CROSSREFS Row n=3 of A331160. Cf. A331196, A331316, Sequence in context: A059167 A003025 A015200 * A030642 A297077 A175563 Adjacent sequences:  A331341 A331342 A331343 * A331345 A331346 A331347 KEYWORD nonn AUTHOR Andrew Howroyd, Jan 14 2020 STATUS approved

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Last modified August 5 22:11 EDT 2020. Contains 336214 sequences. (Running on oeis4.)