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 A002738 Coefficients for extrapolation. (Formerly M3165 N1283) 3
 3, 60, 630, 5040, 34650, 216216, 1261260, 7001280, 37413090, 193993800, 981608628, 4867480800, 23728968900, 114011377200, 540972351000, 2538963567360, 11802213457650, 54396360988200, 248812984520100, 1130341536324000, 5103492036502860, 22913637714910800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Let H be the n X n Hilbert matrix H(i,j) = 1/(i+j-1) for 1 <= i,j <= n. Let B be the inverse matrix of H. The sum of the elements in row n-2 of B equals a(n-3). - T. D. Noe, May 01 2011 REFERENCES J. Ser, Les Calculs Formels des Séries de Factorielles. Gauthier-Villars, Paris, 1933, p. 93. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 J. Ser, Les Calculs Formels des Séries de Factorielles, Gauthier-Villars, Paris, 1933 [Local copy]. J. Ser, Les Calculs Formels des Séries de Factorielles (Annotated scans of some selected pages) FORMULA From Alois P. Heinz, May 02 2011: (Start) a(n) = 3*binomial(2*n+3,n)*binomial(n+3,n). G.f.: 3*(1 + 6*x)/(1-4*x)^(7/2). (End) a(n) = binomial(2*n+3,n)*(n^3 + 6*n^2 + 11*n+6)/2. - Charles R Greathouse IV, May 02 2011 a(n) = 3*A007744(n). - R. J. Mathar, Jan 21 2020 a(n) = (3/2)*( 5*A020918(n) - 3*A002802(n)). - G. C. Greubel, Mar 21 2022 MATHEMATICA Table[Total[Inverse[HilbertMatrix[n]][[n - 2]]], {n, 3, 25}] (* T. D. Noe, May 02 2011 *) PROG (Magma) [3*Binomial(2*n+3, n)*Binomial(n+3, 3): n in [0..30]]; // G. C. Greubel, Mar 21 2022 (Sage) [3*binomial(2*n+3, 3)*binomial(2*n, n) for n in (0..30)] # G. C. Greubel, Mar 21 2022 CROSSREFS Cf. A002802, A007744, A020918. A diagonal of A331431. Sequence in context: A195560 A229749 A283381 * A006432 A195550 A144659 Adjacent sequences: A002735 A002736 A002737 * A002739 A002740 A002741 KEYWORD nonn AUTHOR EXTENSIONS Extended by T. D. Noe, May 01 2011 STATUS approved

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Last modified February 5 12:47 EST 2023. Contains 360084 sequences. (Running on oeis4.)