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 A357720 Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. cos( sqrt(k) * log(1+x) ). 5
 1, 1, 0, 1, 0, 0, 1, 0, -1, 0, 1, 0, -2, 3, 0, 1, 0, -3, 6, -10, 0, 1, 0, -4, 9, -18, 40, 0, 1, 0, -5, 12, -24, 60, -190, 0, 1, 0, -6, 15, -28, 60, -216, 1050, 0, 1, 0, -7, 18, -30, 40, -84, 756, -6620, 0, 1, 0, -8, 21, -30, 0, 200, -756, -1620, 46800, 0, 1, 0, -9, 24, -28, -60, 630, -3360, 13104, -14256, -365300, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,13 LINKS Table of n, a(n) for n=0..77. Eric Weisstein's World of Mathematics, Pochhammer Symbol. FORMULA T(n,k) = Sum_{j=0..floor(n/2)} (-k)^j * Stirling1(n,2*j). T(n,k) = (-1)^n * ( (sqrt(k) * i)_n + (-sqrt(k) * i)_n )/2, where (x)_n is the Pochhammer symbol and i is the imaginary unit. T(0,k) = 1, T(1,k) = 0; T(n,k) = -(2*n-3) * T(n-1,k) - (n^2-4*n+4+k) * T(n-2,k). EXAMPLE Square array begins: 1, 1, 1, 1, 1, 1, ... 0, 0, 0, 0, 0, 0, ... 0, -1, -2, -3, -4, -5, ... 0, 3, 6, 9, 12, 15, ... 0, -10, -18, -24, -28, -30, ... 0, 40, 60, 60, 40, 0, ... PROG (PARI) T(n, k) = sum(j=0, n\2, (-k)^j*stirling(n, 2*j, 1)); (PARI) T(n, k) = (-1)^n*round((prod(j=0, n-1, sqrt(k)*I+j)+prod(j=0, n-1, -sqrt(k)*I+j)))/2; CROSSREFS Columns k=0-4 give: A000007, (-1)^n * A003703, A357693, A357718, A357719. Main diagonal gives A357721. Cf. A357712, A357728. Sequence in context: A259748 A357728 A357681 * A357712 A298159 A123735 Adjacent sequences: A357717 A357718 A357719 * A357721 A357722 A357723 KEYWORD sign,tabl AUTHOR Seiichi Manyama, Oct 10 2022 STATUS approved

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Last modified May 23 18:34 EDT 2024. Contains 372765 sequences. (Running on oeis4.)