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Search: id:A081275
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| 1, 31, 97, 199, 337, 511, 721, 967, 1249, 1567, 1921, 2311, 2737, 3199, 3697, 4231, 4801, 5407, 6049, 6727, 7441, 8191, 8977, 9799, 10657, 11551, 12481, 13447, 14449, 15487, 16561, 17671, 18817, 19999, 21217, 22471, 23761, 25087, 26449, 27847
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Reflection of A060544 in the horizontal A051682.
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FORMULA
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a(n)=C(n, 0)+30C(n, 1)+36C(n, 2); binomial transform of (1, 30, 36, 0, 0, 0, .....). a(n)=18n^2+12n+1. G.f.(1+28x+7x^2)/(1-x)^3.
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CROSSREFS
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Cf. A092296.
Sequence in context: A042898 A044218 A044599 this_sequence A139509 A039463 A075936
Adjacent sequences: A081272 A081273 A081274 this_sequence A081276 A081277 A081278
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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), Mar 15 2003
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