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 A257626 Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 3*x + 6. 5
 1, 6, 6, 36, 108, 36, 216, 1404, 1404, 216, 1296, 15876, 33696, 15876, 1296, 7776, 166212, 642492, 642492, 166212, 7776, 46656, 1659204, 10701720, 19274760, 10701720, 1659204, 46656, 279936, 16052580, 163263924, 481752360, 481752360, 163263924, 16052580, 279936 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are: 1, 12, 180, 3240, 68040, 1632960, 44089920, 1322697600, 43649020800, 1571364748800, ... (see A051609). LINKS FORMULA T(n,k) = t(n-k, k); t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 3*x + 6. EXAMPLE 1 6 6 36 108 36 216 1404 1404 216 1296 15876 33696 15876 1296 7776 166212 642492 642492 166212 7776 46656 1659204 10701720 19274760 10701720 1659204 46656 279936 16052580 163263924 481752360 481752360 163263924 16052580 279936 CROSSREFS Cf. A142458, A257610, A257620, A257622, A257624. See similar sequences listed in A256890. Sequence in context: A038260 A242087 A217978 * A222340 A215270 A203057 Adjacent sequences:  A257623 A257624 A257625 * A257627 A257628 A257629 KEYWORD nonn,tabl AUTHOR Dale Gerdemann, May 10 2015 STATUS approved

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Last modified March 31 19:37 EDT 2020. Contains 333151 sequences. (Running on oeis4.)