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Search: id:A115565
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| A115565 |
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5*n^4 - 10*n^3 + 20*n^2 - 15*n + 11. |
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+0
1
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| 11, 61, 281, 911, 2311, 4961, 9461, 16531, 27011, 41861, 62161, 89111, 124031, 168361, 223661, 291611, 374011, 472781, 589961, 727711, 888311, 1074161, 1287781, 1531811, 1809011, 2122261, 2474561, 2869031, 3308911, 3797561, 4338461, 4935211, 5591531
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(1-n) = a(n) = 5*(n^2-n)^2 +15*(n^2-n) +11. - Michael Somos May 15 2006
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PROGRAM
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ay1[1] := 11; a[1] :=50; b[1] :=170; c[1] :=240; k := 120; Repeat ay1[1] := ay1[1] + a[1]; a[1] := a[1] + b[1]; b[1] := b[1] + c[1]; c[1] := c[1] + k; writeln(ay1[1]); Until 1 < 0;
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CROSSREFS
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Sequence in context: A089764 A023298 A106992 this_sequence A137410 A156095 A068846
Adjacent sequences: A115562 A115563 A115564 this_sequence A115566 A115567 A115568
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KEYWORD
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nonn
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AUTHOR
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Aldrich Stevens (Aldrichstevens(AT)msn.com), Mar 11 2006
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EXTENSIONS
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Checked by N. J. A. Sloane (njas(AT)research.att.com), Mar 29 2006
Edited by N. J. A. Sloane (njas(AT)research.att.com), Jun 13 2008
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