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A096431
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Denominator of (9(n^4-2n^3+2n^2-n)+2)/(2(2n-1)).
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1
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1, 3, 1, 7, 9, 11, 13, 3, 17, 19, 21, 23, 5, 27, 29, 31, 33, 7, 37, 39, 41, 43, 9, 47, 49, 51, 53, 11, 57, 59, 61, 63, 13, 67, 69, 71, 73, 15, 77, 79, 81, 83, 17, 87, 89, 91, 93, 19, 97, 99, 101, 103, 21, 107, 109, 111, 113, 23, 117, 119, 121, 123, 25, 127, 129, 131, 133
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..67.
Eric Weisstein's World of Mathematics, Magic Hexagon
Index to sequences with linear recurrences with constant coefficients, signature (0,0,0,0,2,0,0,0,0,-1).
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FORMULA
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Satisfies a linear recurrence with characteristic polynomial (1-x^5)^2.
G.f. x*(1+x) *(x^8+2*x^7-x^6+8*x^5+x^4+8*x^3-x^2+2*x+1) / ( (x-1)^2 *(x^4+x^3+x^2+x+1)^2 ). - R. J. Mathar, Mar 11 2011
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EXAMPLE
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1, 28/3, 38, 703/7, 1891/9, 4186/11, ...
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CROSSREFS
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Cf. A097361.
Sequence in context: A087129 A011308 A033465 * A171501 A196845 A218592
Adjacent sequences: A096428 A096429 A096430 * A096432 A096433 A096434
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KEYWORD
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nonn,easy,frac
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AUTHOR
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Eric W. Weisstein, Aug 09, 2004
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STATUS
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approved
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