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Search: id:A130487
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| 0, 1, 3, 6, 10, 15, 21, 28, 36, 36, 37, 39, 42, 46, 51, 57, 64, 72, 72, 73, 75, 78, 82, 87, 93, 100, 108, 108, 109, 111, 114, 118, 123, 129, 136, 144, 144, 145, 147, 150, 154, 159, 165, 172, 180, 180, 181, 183, 186, 190, 195, 201, 208, 216, 216, 217, 219, 222, 226
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n)=36*floor(n/9)+A010878(n)*(A010878(n)+1)/2. G.f.: g(x)=(sum{1<=k<9, k*x^k})/((1-x^9)(1-x)). Also: g(x)=x(8x^9-9x^8+1)/((1-x^9)(1-x)^3).
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MAPLE
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a:=n->add(chrem( [n, j], [1, 9] ) , j=1..n):seq(a(n), n=0..58); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 07 2009]
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CROSSREFS
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Cf. A010872, A010873, A010874, A010875, A010876, A010877. A130481, A130482, A130483, A130484, A130485, A130486.
Sequence in context: A124157 A033440 A067525 this_sequence A108923 A033441 A107082
Adjacent sequences: A130484 A130485 A130486 this_sequence A130488 A130489 A130490
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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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