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A016993
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a(n) = 7*n + 1.
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32
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1, 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 120, 127, 134, 141, 148, 155, 162, 169, 176, 183, 190, 197, 204, 211, 218, 225, 232, 239, 246, 253, 260, 267, 274, 281, 288, 295, 302, 309, 316, 323, 330, 337, 344, 351, 358, 365, 372, 379
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OFFSET
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0,2
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COMMENTS
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For n > 3, also the number of (not necessarily maximal) cliques in the n-web graph. - Eric W. Weisstein, Nov 29 2017
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LINKS
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Eric Weisstein's World of Mathematics, Clique
Eric Weisstein's World of Mathematics, Web Graph
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FORMULA
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a(n) = 7*n + 1.
G.f.: (1+6*x)/(1-x)^2.
a(n) = 2*a(n-1) - a(n-2).
E.g.f.: (1 + 7*x)*exp(x). (End)
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MAPLE
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MATHEMATICA
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CoefficientList[Series[(1 + 6 x)/(-1 + x)^2, {x, 0, 20}], x] (* Eric W. Weisstein, Nov 29 2017 *)
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PROG
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(Haskell)
a016993 = (+ 1) . (* 7)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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