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Search: id:A052181
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| 1, 12, 72, 300, 990, 2772, 6864, 15444, 32175, 62920, 116688, 206856, 352716, 581400, 930240, 1449624, 2206413, 3287988, 4807000, 6906900, 9768330, 13616460, 18729360, 25447500
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
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FORMULA
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a(n)=(n+2)*C(n+7, 7)/2.
G.f.: (1+3*x)/(1-x)^9.
C(n+2, 2)*C(n+7, 6)/7. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 29 2005
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MAPLE
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a:=n->(sum((numbcomp(n, 8)), j=7..n))/2:seq(a(n), n=8..31); [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 26 2008]
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CROSSREFS
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Cf. A050483.
Cf. A093561 ((4, 1) Pascal, column m=8).
a(n)=A027819/7.
Sequence in context: A008533 A010024 A008414 this_sequence A118979 A014970 A036392
Adjacent sequences: A052178 A052179 A052180 this_sequence A052182 A052183 A052184
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KEYWORD
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easy,nonn
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AUTHOR
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Barry E. Williams, Jan 26 2000
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