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A014484
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Expansion of (1+2x)/(1-2x)^4 (E.g.f.).
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2
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1, 10, 112, 1440, 21120, 349440, 6451200, 131604480, 2941747200, 71530905600, 1880240947200, 53137244160000, 1606870263398400, 51776930709504000, 1771128112545792000, 64103411041173504000
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OFFSET
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0,2
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LINKS
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FORMULA
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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
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MAPLE
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seq((n+1)*(n+2)*(2*n+3)/6 * 2^n * n!, n=0..30); # Robert Israel, Jul 11 2018
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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