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 A256411 Triangle read by rows: T(n,k) (1 <= k <= n) = number of ascendingly generated semigroups of order n with k generators. 1
 1, 2, 8, 3, 37, 113, 4, 145, 1257, 3492, 5, 452, 9020, 67394, 183732, 6, 1374, 60826, 938194, 6398792, 17061118, 7, 3933, 356023, 30492722, 466578957, 3032145644, 7743056064 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Alex Bailey, Martin Finn-Sell, Robert Snocken, Subsemigroup, ideal and congruence growth of free semigroups, arXiv preprint arXiv:1409.2444 [math.GR], 2014. EXAMPLE Triangle begins:   1;   2,    8;   3,   37,    113;   4,  145,   1257,     3492;   5,  452,   9020,    67394,    183732;   6, 1374,  60826,   938194,   6398792,   17061118;   7, 3933, 356023, 30492722, 466578957, 3032145644, 7743056064;   ... CROSSREFS Main diagonal is A023814. Column 2 is A256412. Sequence in context: A292930 A126951 A282637 * A218609 A268491 A076588 Adjacent sequences:  A256408 A256409 A256410 * A256412 A256413 A256414 KEYWORD nonn,tabl,more AUTHOR N. J. A. Sloane, Apr 03 2015 STATUS approved

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Last modified May 18 18:24 EDT 2022. Contains 353823 sequences. (Running on oeis4.)