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 A293718 Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} j*x^j). 5
 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 5, 13, 1, 1, 1, 5, 31, 73, 1, 1, 1, 5, 31, 145, 281, 1, 1, 1, 5, 31, 241, 1181, 1741, 1, 1, 1, 5, 31, 241, 1661, 9661, 8485, 1, 1, 1, 5, 31, 241, 2261, 16861, 77155, 57233, 1, 1, 1, 5, 31, 241, 2261, 20461, 181315, 794081 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,9 LINKS Seiichi Manyama, Antidiagonals n = 0..139, flattened FORMULA A(0,k) = 1 and A(n,k) = (n-1)! * Sum_{j=1..min(k,n)} j^2*A(n-j,k)/(n-j)!. EXAMPLE Square array begins:    1,   1,    1,    1,    1, ...    1,   1,    1,    1,    1, ...    1,   5,    5,    5,    5, ...    1,  13,   31,   31,   31, ...    1,  73,  145,  241,  241, ...    1, 281, 1181, 1661, 2261, ... CROSSREFS Columns k=1..4 give A000012, A115329, A293716, A293717. Rows n=0-1 give A000012. Main diagonal gives A082579. Cf. A293669, A293724. Sequence in context: A222119 A102280 A035316 * A068316 A284252 A284254 Adjacent sequences:  A293715 A293716 A293717 * A293719 A293720 A293721 KEYWORD nonn,tabl AUTHOR Seiichi Manyama, Oct 15 2017 STATUS approved

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Last modified September 23 15:23 EDT 2021. Contains 347618 sequences. (Running on oeis4.)