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Search: id:A098574
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| A098574 |
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Sum C(n-5k,2k), k=0..floor(n/7). |
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+0
2
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| 1, 1, 1, 1, 1, 1, 1, 2, 4, 7, 11, 16, 22, 29, 38, 51, 71, 102, 149, 218, 316, 452, 639, 897, 1257, 1766, 2493, 3536, 5031, 7165, 10196, 14484, 20538, 29085, 41168, 58282, 82561, 117036, 165995, 235492, 334074, 473824, 671856, 952449, 1350078, 1913702
(list; graph; listen)
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OFFSET
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0,8
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REFERENCES
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R. Austin and R. K. Guy, Binary sequences without isolated ones, Fib. Quart., 16 (1978), 84-86.
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FORMULA
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G.f. (1-x)/(1-2x+x^2-x^7)
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MAPLE
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ZL:=[S, {a = Atom, b = Atom, S = Prod(X, Sequence(Prod(X, X, b))), X = Sequence(b, card >= 3)}, unlabelled]: seq(combstruct[count](ZL, size=n), n=3..48); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 26 2008
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CROSSREFS
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Cf. A005251, A005252, A005253, A005689.
Sequence in context: A025739 A000124 A152947 this_sequence A005689 A131075 A133523
Adjacent sequences: A098571 A098572 A098573 this_sequence A098575 A098576 A098577
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Sep 16 2004
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