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Search: id:A130490
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| 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 66, 67, 69, 72, 76, 81, 87, 94, 102, 111, 121, 132, 132, 133, 135, 138, 142, 147, 153, 160, 168, 177, 187, 198, 198, 199, 201, 204, 208, 213, 219, 226, 234, 243, 253, 264, 264, 265, 267, 270, 274, 279, 285, 292, 300
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OFFSET
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9,3
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FORMULA
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a(n)=66*floor(n/12)+A010881(n)*(A010881(n)+1)/2. G.f.: g(x)=(sum{1<=k<12, k*x^k})/((1-x^12)(1-x)). Also: g(x)=x(11x^12-12x^11+1)/((1-x^12)(1-x)^3).
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CROSSREFS
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Cf. A010872, A010873, A010874, A010875, A010876, A010877, A010878, A010879, A010880. A130481, A130482, A130483, A130484, A130485, A130486, A130487, A130488, A130489.
Sequence in context: A105335 A130489 A033443 this_sequence A033444 A061791 A105336
Adjacent sequences: A130487 A130488 A130489 this_sequence A130491 A130492 A130493
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KEYWORD
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nonn
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AUTHOR
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Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), May 31 2007
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