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A093315
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Number of permutations s_1,s_2,...,s_n of 1,2,...,n with s_1 = 4 and such that for all j=1,2,...,n, s_j divides Sum_{i=1..j} s_i.
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4
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0, 0, 0, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 6, 8, 3, 14, 12, 18, 13, 14, 6, 26, 13, 198, 152, 220, 118, 1033, 807
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OFFSET
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1,5
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COMMENTS
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The beginning elements of the permutation are 4, (either 1 or 2), ...
The total number of permutations with this property is given in A067957.
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REFERENCES
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Matthijs Coster, Problem 2001/3-A of the Universitaire Wiskunde Competitie, Nieuw Arch. Wisk. 5/3 (2002), 92-94.
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LINKS
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Table of n, a(n) for n=1..40.
Matthijs Coster, Sequences
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CROSSREFS
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Cf. A067957, A093313, A093315.
Sequence in context: A049337 A076953 A180472 * A204267 A132784 A180834
Adjacent sequences: A093312 A093313 A093314 * A093316 A093317 A093318
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KEYWORD
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nonn
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AUTHOR
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Matthijs Coster, Apr 26 2004
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STATUS
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approved
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