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Search: id:A052254
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| 1, 17, 108, 444, 1410, 3762, 8844, 18876, 37323, 69355, 122408, 206856, 336804, 531012, 813960, 1217064, 1780053, 2552517, 3595636, 4984100, 6808230, 9176310, 12217140, 16082820, 20951775
(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.
Murray R. Spiegel, Calculus of Finite Differences and Difference Equations, "Schaum's Outline Series", McGraw-Hill, 1971, pps. 10-=20, 79-94.
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FORMULA
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a(n)=(10n+7)*C(n+6, 6)/7.
G.f.: (1+9*x)/(1-x)^8.
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CROSSREFS
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Cf. A050406.
Cf. A093645 ((10, 1) Pascal, column m=7).
Sequence in context: A126485 A080441 A135400 this_sequence A141921 A108649 A139858
Adjacent sequences: A052251 A052252 A052253 this_sequence A052255 A052256 A052257
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KEYWORD
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easy,nonn
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AUTHOR
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Barry E. Williams, Feb 03 2000
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