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A336269
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Number of compositions of n containing no part p of multiplicity p.
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4
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1, 0, 2, 2, 5, 11, 18, 36, 84, 155, 305, 625, 1269, 2487, 5070, 10263, 20964, 41905, 84799, 170540, 346192, 696157, 1405156, 2822998, 5686402, 11420892, 22949684, 46028648, 92347798, 185051670, 370756866, 742307736, 1485798060, 2972924906, 5947567564
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OFFSET
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0,3
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LINKS
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FORMULA
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MAPLE
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b:= proc(n, i, p) option remember; `if`(n=0, p!, `if`(i<1, 0,
add(`if`(i=j, 0, b(n-i*j, i-1, p+j)/j!), j=0..n/i)))
end:
a:= n-> b(n$2, 0):
seq(a(n), n=0..40);
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MATHEMATICA
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b[n_, i_, p_] := b[n, i, p] = If[n == 0, p!, If[i < 1, 0,
Sum[If[i == j, 0, b[n - i*j, i - 1, p + j]/j!], {j, 0, n/i}]]];
a[n_] := b[n, n, 0];
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CROSSREFS
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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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