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A206558
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Number of 8's in the outer shell of the partitions of n.
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3
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0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 2, 2, 4, 4, 8, 8, 13, 15, 23, 26, 38, 45, 63, 74, 101, 120, 160, 191, 248, 298, 383, 457, 579, 694, 868, 1038, 1287, 1536, 1890, 2251, 2746, 3267, 3962, 4698, 5665, 6706, 8043, 9496, 11337, 13354, 15876, 18657, 22089
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OFFSET
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1,12
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COMMENTS
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Zero together with the first differences of A024792. Also number of occurrences of 8 in all partitions of n that do not contain 1 as a part. For the definition of "outer shell of n" see A135010. It appears that the sums of eight successive terms give the partition numbers A000041.
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LINKS
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Table of n, a(n) for n=1..54.
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FORMULA
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It appears that A000041(n) = Sum_{j=1..8} a(n+j), n >= 0.
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PROG
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(Sage) A206558 = lambda n: sum(list(p).count(8) for p in Partitions(n) if 1 not in p)
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CROSSREFS
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Column 8 of A182703 and of A194812.
Cf. A000041, A135010, A138121, A182712-A182714, A206555- A206557, A206559, A206560.
Sequence in context: A051754 A108747 A116931 * A145810 A172148 A205478
Adjacent sequences: A206555 A206556 A206557 * A206559 A206560 A206561
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol, Feb 09 2012
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STATUS
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approved
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