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Search: id:A056126
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| 0, 9, 19, 30, 42, 55, 69, 84, 100, 117, 135, 154, 174, 195, 217, 240, 264, 289, 315, 342, 370, 399, 429, 460, 492, 525, 559, 594, 630, 667, 705, 744, 784, 825, 867, 910, 954, 999, 1045, 1092, 1140, 1189, 1239, 1290, 1342, 1395, 1449, 1504, 1560, 1617, 1675
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n)=A000096 + 7 * A001477, a(n)=A056121 + A001477 and a(n)=A051942 - A001477 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 01 2006
a(n) = A126890(n,8) for n>7. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Dec 30 2006
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FORMULA
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G.f.(x)=x(9-8x)/(1-x)^3.
a(n)=C(n,2)-8*n ,n>=17 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 26 2006
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MAPLE
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a:=n->sum(floor(k+2*n/(k+n)), k=8..n): seq(a(n), n=7..57); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 01 2006
[seq(binomial(n, 2)-8*n , n=17..67)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 26 2006
a:=n->sum(n, j=18..n): seq(a(n)/2, n=17..67); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 17 2008
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CROSSREFS
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Cf. A056121.
Cf. A000096, A056121, A051942, A056000, A001477.
Cf. A001477, A098849, A120071, A132760, A132761, A132765.
Adjacent sequences: A056123 A056124 A056125 this_sequence A056127 A056128 A056129
Sequence in context: A043525 A031499 A017377 this_sequence A051811 A034056 A039299
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KEYWORD
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easy,nonn
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AUTHOR
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Barry E. Williams, Jul 07 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jul 10 2000
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