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 A054457 Pell numbers A000129(n+1) (without P(0)) convoluted twice with itself. 7
 1, 6, 27, 104, 366, 1212, 3842, 11784, 35223, 103122, 296805, 842160, 2360780, 6549240, 18004980, 49106992, 132996957, 357948894, 957993823, 2550977112, 6761742234, 17848312884, 46932923478, 122980461816 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(n)= A054456(n+2,2) (third column of Pell convolution triangle). LINKS FORMULA a(n)= ((10*n^2+39*n+32)*P(n+1)+(n+1)*(4*n+11)*P(n))/32, P(n)=A000129(n). G.f.: 1/(1-2*x-x^2)^3. a(n)=F''(n+3, 2)/2, that is, 1/2 times the 2nd derivative of the (n+3)th Fibonacci polynomial evaluated at x=2. - T. D. Noe, Jan 19 2006 CROSSREFS Cf. A054456, A000129, A006645. Sequence in context: A057222 A124641 A169793 * A000395 A005325 A099623 Adjacent sequences:  A054454 A054455 A054456 * A054458 A054459 A054460 KEYWORD easy,nonn AUTHOR Wolfdieter Lang, Apr 27 2000 STATUS approved

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Last modified May 20 16:20 EDT 2013. Contains 225463 sequences.