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 A171589 Riordan array (f(x), x*f(x)) where f(x) is the g.f. of A104455. 2
 1, 4, 1, 17, 8, 1, 77, 50, 12, 1, 371, 290, 99, 16, 1, 1890, 1647, 703, 164, 20, 1, 10095, 9366, 4644, 1380, 245, 24, 1, 56040, 53853, 29592, 10434, 2385, 342, 28, 1, 320795, 314234, 185411, 74084, 20345, 3782, 455, 32, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Equal to B*A171568 = A125906*B^(-1), B = A007318. LINKS FORMULA T(n,0)-T(n,1)=3^n. T(n,k) = T(n-1,k-1) + 4*T(n-1,k) + sum_{i, i>=0} T(n-1,k+1+i). - Philippe Deléham, Feb 23 2012 EXAMPLE Triangle begins : 1 4, 1 17, 8, 1 77, 50, 12, 1 371, 290, 99, 16, 1 1890, 1647, 703, 164, 20, 1 10095, 9366, 4644, 1380, 245, 24, 1 Production matrix begins 4, 1 1, 4, 1 1, 1, 4, 1 1, 1, 1, 4, 1 1, 1, 1, 1, 4, 1 1, 1, 1, 1, 1, 4, 1 1, 1, 1, 1, 1, 1, 4, 1 1, 1, 1, 1, 1, 1, 1, 4, 1 ... - Philippe Deléham, Mar 05 2013 CROSSREFS Cf. A104455, A125906, A171568, Sequence in context: A301624 A126791 A052179 * A126331 A013631 A113355 Adjacent sequences:  A171586 A171587 A171588 * A171590 A171591 A171592 KEYWORD nonn,tabl AUTHOR Philippe Deléham, Dec 12 2009 STATUS approved

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Last modified July 17 18:47 EDT 2019. Contains 325109 sequences. (Running on oeis4.)