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Search: id:A143962
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| 0, 0, 0, 0, 1, 5, 16, 42, 99, 220, 476, 1023, 2201, 4732, 10102, 21284, 44103, 89845, 180354, 358226, 707561, 1396560, 2764906, 5501807, 11005363, 22101301, 44470622, 89475559, 179753753, 360325116, 720748862, 1439561539, 2873846383
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OFFSET
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0,6
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LINKS
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N. J. A. Sloane, Transforms
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FORMULA
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a(n) = Sum_{k=4..n} C(n,k)*A066247(k).
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EXAMPLE
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a(7) = [35,21,7,1]*[1,0,1,0] = 35+7 = 42.
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MAPLE
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a:= proc(n) local k, s; s:=0; for k from 4 to n do if not isprime(k) then s:= s+ binomial(n, k) fi od; s; end: seq (a(n), n=0..40);
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CROSSREFS
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Cf. A007318, A066247.
Sequence in context: A097810 A055796 A002662 this_sequence A066634 A034358 A036888
Adjacent sequences: A143959 A143960 A143961 this_sequence A143963 A143964 A143965
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KEYWORD
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nonn
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AUTHOR
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Alois P. Heinz (heinz(AT)hs-heilbronn.de), Sep 05 2008
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