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 A014484 Expansion of (1+2x)/(1-2x)^4 (E.g.f.). 2
 1, 10, 112, 1440, 21120, 349440, 6451200, 131604480, 2941747200, 71530905600, 1880240947200, 53137244160000, 1606870263398400, 51776930709504000, 1771128112545792000, 64103411041173504000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Robert Israel, Table of n, a(n) for n = 0..400 FORMULA a(n) = (n+1)(n+2)(2n+3)/6 * 2^n * n!. - Ralf Stephan, Mar 24 2004 Conjecture: a(n) +(-2*n-9)*a(n-1) +6*(n+1)*a(n-2)=0. - R. J. Mathar, Jun 11 2013 Conjecture verified by Robert Israel, Jul 11 2018 MAPLE seq((n+1)*(n+2)*(2*n+3)/6 * 2^n * n!, n=0..30); # Robert Israel, Jul 11 2018 PROG (PARI) a(n)=(n+1)*(n+2)*(2*n+3)/6*2^n*n! \\ Charles R Greathouse IV, Jun 11 2013 CROSSREFS Cf. A006157. Sequence in context: A322724 A184131 A239651 * A110040 A298074 A181042 Adjacent sequences:  A014481 A014482 A014483 * A014485 A014486 A014487 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified October 23 10:06 EDT 2019. Contains 328345 sequences. (Running on oeis4.)