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 A144381 a(n) = A142458(n+5, n). Fifth diagonal of A142458 triangle. 3
 1, 677, 47175, 1709675, 44451550, 947113254, 17716715490, 302925749370, 4856552119935, 74258231957275, 1095758678253041, 15736592058221517, 221321453958111620, 3062416225698505060, 41836761536767296660, 565817483249269872324, 7591501608353930033805, 101209790951020335444705 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS G. C. Greubel, Table of n, a(n) for n = 1..890 Index entries for linear recurrences with constant coefficients, signature (75, -2520, 50204, -661458, 6086718, -40273648, 194372208, -687083013, 1771618303, -3293261472, 4325310828, -3886563008, 2261691264, -765434880, 114150400). FORMULA a(n) = A142458(n+5, n). From G. C. Greubel, Mar 16 2022: (Start) G.f.: x*(1 +602*x -1080*x^2 -172614*x^3 +1780275*x^4 -5025348*x^5 -7549548*x^6 +60043488*x^7 -99645984*x^8 +39979520*x^9 +27596800*x^10)/((1-x)^5*(1-4*x)^4*(1-7*x)^3*(1-10*x)^2*(1-13*x)). a(n) = (1/1944)*((27*n^3 +216*n^2 +549*n +440)*(3*n +2 - 2*4^(n+4)) + 60*(9*n^2 +57*n +88)*7^(n+3) -32*(3*n+11)*10^(n+4) + 880*13^(n+3)). (End) MATHEMATICA T[n_, k_, m_]:= T[n, k, m]= If[k==1 || k==n, 1, (m*n-m*k+1)*T[n-1, k-1, m] + (m*k-m+1)*T[n-1, k, m]]; A144381[n_]:= T[n+4, n, 3]; Table[A144381[n], {n, 30}] (* modified by G. C. Greubel, Mar 16 2022 *) PROG (Magma) [(1/1944)*((27*n^3 + 216*n^2 + 549*n + 440)*(3*n + 2 - 2*4^(n + 4)) + 60*(9*n^2 + 57*n + 88)*7^(n + 3) - 32*(3*n + 11)*10^(n + 4) + 880*13^(n + 3)): n in [1..30]]; // G. C. Greubel, Mar 16 2022 (Sage) @CachedFunction def T(n, k, m): # A144381 if (k==1 or k==n): return 1 else: return (m*(n-k)+1)*T(n-1, k-1, m) + (m*k-m+1)*T(n-1, k, m) def A144381(n): return T(n+4, n, 3) [A144381(n) for n in (1..30)] # G. C. Greubel, Mar 16 2022 CROSSREFS Cf. A142458, A142976, A144380, A144414. Sequence in context: A205749 A108824 A205471 * A097773 A248887 A031524 Adjacent sequences: A144378 A144379 A144380 * A144382 A144383 A144384 KEYWORD nonn AUTHOR Roger L. Bagula and Gary W. Adamson, Oct 01 2008 EXTENSIONS Edited by G. C. Greubel, Mar 16 2022 STATUS approved

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Last modified November 27 03:51 EST 2022. Contains 358362 sequences. (Running on oeis4.)