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A104720
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Expansion of 1/((1-x)(1-x^2)(1-10x)).
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0
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1, 11, 112, 1122, 11223, 112233, 1122334, 11223344, 112233445, 1122334455, 11223344556, 112233445566, 1122334455667, 11223344556677, 112233445566778, 1122334455667788, 11223344556677889, 112233445566778899, 1122334455667789000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Partial sums of A056830(n+1).
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FORMULA
| a(n)=1000*10^n/891+(-1)^n/44-(18n+47)/324
a(n) = floor((2*10^(n+3)-99n)/1782) - Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Dec 05 2006
a(n) = 10*a(n-1) + (2*n +3 +(-1)^n)/4, a(0)=1, a(1)=11. - Vincenzo Librandi, Mar 22 2011
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CROSSREFS
| Sequence in context: A075842 A037535 A065834 * A132926 A094704 A019523
Adjacent sequences: A104717 A104718 A104719 * A104721 A104722 A104723
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Mar 20 2005
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