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A144508
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a(n) = total number of partitions of [1, 2, ..., k] into exactly n blocks, each of size 1, 2, 3 or 4, for 0 <= k <= 4n.
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14
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1, 4, 121, 18252, 7958726, 7528988476, 13130817809439, 38001495237579931, 169490425291053577442, 1102725620990181693266071, 10030550674270068548738783696, 123317200510025161580777179001154, 1993320784474917266370637900936051186, 41401645296339316791633672053851083955147
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OFFSET
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0,2
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COMMENTS
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Also, number of scenarios in the Gift Exchange Game when a gift can be stolen at most 3 times. - N. J. A. Sloane, Jan 25 2017
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LINKS
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Moa Apagodu, David Applegate, N. J. A. Sloane, and Doron Zeilberger, On-Line Appendix I to "Analysis of the gift exchange problem", giving Type D recurrences for G_1(n) through G_15(n) (see A001515, A144416, A144508, A144509, A149187, A281358-A281361)
Moa Apagodu, David Applegate, N. J. A. Sloane, and Doron Zeilberger, On-Line Appendix II to "Analysis of the gift exchange problem", giving Type C recurrences for G_1(n) through G_15(n) (see A001515, A144416, A144508, A144509, A149187, A281358-A281361)
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MATHEMATICA
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t[n_, n_] = 1; t[n_ /; n >= 0, k_] /; 0 <= k <= 4*n := t[n, k] = t[n - 1, k - 1] + (k - 1)*t[n - 1, k - 2] + (1/2)*(k - 1)*(k - 2)*t[n - 1, k - 3] + (1/6)*(k - 1)*(k - 2)*(k - 3)*t[n - 1, k - 4]; t[_, _] = 0; a[n_] := Sum[t[n, k], {k, 0, 4*n}]; Table[a[n], {n, 0, 15}] (* Jean-François Alcover, Feb 18 2017 *)
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PROG
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(PARI) {a(n) = sum(i=n, 4*n, i!*polcoef(sum(j=1, 4, x^j/j!)^n, i))/n!} \\ Seiichi Manyama, May 22 2019
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CROSSREFS
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The gift scenarios sequences when a gift can be stolen at most s times, for s = 1..9, are A001515, A144416, A144508, A144509, A149187, A281358, A281359, A281360, A281361.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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