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 A308323 a(n) = Sum_{i_1=0..n} Sum_{i_2=0..n} ... Sum_{i_n=0..n} (-1)^(i_1 + i_2 + ... + i_n) * multinomial(i_1 + i_2 + ... + i_n; i_1, i_2, ..., i_n). 2
 1, 0, 3, -692, 25413205, -247578134832564, 1049539393188856278390451, -2871690441592604257533055860715129272, 7040796701370550878156702345258827433898638874681737, -20490586759699718697495728993626502030472234718733294544426997558792280 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..26 PROG (PARI) {a(n) = sum(i=0, n^2, (-1)^i*i!*polcoef(sum(j=0, n, x^j/j!)^n, i))} CROSSREFS Main diagonal of A308322. Cf. A274762. Sequence in context: A278316 A266639 A203496 * A276455 A231604 A306961 Adjacent sequences:  A308320 A308321 A308322 * A308324 A308325 A308326 KEYWORD sign AUTHOR Seiichi Manyama, May 20 2019 STATUS approved

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Last modified January 21 11:01 EST 2020. Contains 331105 sequences. (Running on oeis4.)