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 A121987 a(n + 4) = (n + 2)*(a(n + 3) - a(n) + 1) for n > 3, a(0) = a(1) = a(2) = a(3) = 1. 1
 1, 1, 1, 1, 2, 6, 24, 120, 714, 4963, 39520, 354609, 3538960, 38873978, 466013508, 6053565700, 84700374374, 1269922505955, 20311303879168, 345189255328973, 6211881989182800, 118001629266860074, 2359626359259618140 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS G. C. Greubel, Table of n, a(n) for n = 0..450 MATHEMATICA RecurrenceTable[{a[n + 4] == (n + 2)*(a[n + 3] - a[n] + 1), a[0] == 1, a[1] == 1, a[2] == 1, a[3] == 1}, a, {n, 0, 50}] (* G. C. Greubel, Sep 14 2017 *) CROSSREFS Sequence in context: A324134 A324135 A177531 * A324132 A177524 A223905 Adjacent sequences: A121984 A121985 A121986 * A121988 A121989 A121990 KEYWORD nonn,easy AUTHOR Roger L. Bagula, Sep 10 2006 EXTENSIONS Edited by N. J. A. Sloane, Jun 17 2007 Edited and name changed by G. C. Greubel, Sep 14 2017 STATUS approved

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Last modified June 6 17:41 EDT 2023. Contains 363149 sequences. (Running on oeis4.)