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 A213832 Principal diagonal of the convolution array A213831. 3
 1, 19, 78, 202, 415, 741, 1204, 1828, 2637, 3655, 4906, 6414, 8203, 10297, 12720, 15496, 18649, 22203, 26182, 30610, 35511, 40909, 46828, 53292, 60325, 67951, 76194, 85078, 94627, 104865, 115816, 127504 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Clark Kimberling, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1). FORMULA G.f.: x*(1 + 15*x + 8*x^2)/(1-x)^4. a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4). a(n) = (n - 7*n^2 + 8*n^3)/2. a(n) = Sum_{i = 0..n-1} (n + i)*(n + 3*i). - Bruno Berselli, Feb 14 2018 MATHEMATICA (See A213831.) CROSSREFS Cf. A213831. Sequence in context: A304513 A041698 A041700 * A132234 A074822 A139871 Adjacent sequences:  A213829 A213830 A213831 * A213833 A213834 A213835 KEYWORD nonn,easy AUTHOR Clark Kimberling, Jul 04 2012 STATUS approved

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Last modified August 11 06:25 EDT 2020. Contains 336422 sequences. (Running on oeis4.)