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A320738
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Number of partitions of n with seven sorts of part 1 which are introduced in ascending order.
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4
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1, 1, 3, 7, 20, 63, 233, 966, 4453, 22367, 120819, 693233, 4178068, 26179581, 169020426, 1115994109, 7491323062, 50893512269, 348746702822, 2404544709055, 16651752622351, 115675136440751, 805342277995251, 5615683405472021, 39202038270665250, 273878789880840798
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OFFSET
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0,3
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LINKS
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Alois P. Heinz, Table of n, a(n) for n = 0..1187
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MAPLE
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b:= proc(n, i) option remember; `if`(n=0 or i<2, add(
Stirling2(n, j), j=0..7), add(b(n-i*j, i-1), j=0..n/i))
end:
a:= n-> b(n$2):
seq(a(n), n=0..40);
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MATHEMATICA
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b[n_, i_] := b[n, i] = If[n == 0 || i < 2, Sum[StirlingS2[n, j], {j, 0, 7}], Sum[b[n - i j, i - 1], {j, 0, n/i}]];
a[n_] := b[n, n];
a /@ Range[0, 40] (* Jean-François Alcover, Dec 07 2020, after Alois P. Heinz *)
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CROSSREFS
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Column k=7 of A292745.
Sequence in context: A176697 A320736 A320737 * A320739 A320740 A320741
Adjacent sequences: A320735 A320736 A320737 * A320739 A320740 A320741
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KEYWORD
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nonn
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AUTHOR
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Alois P. Heinz, Oct 20 2018
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STATUS
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approved
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