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Search: id:A107731
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| 1, 21, 141, 521, 1401, 3101, 6021, 10641, 17521, 27301, 40701, 58521, 81641, 111021, 147701, 192801, 247521, 313141, 391021, 482601, 589401, 713021, 855141, 1017521, 1202001, 1410501, 1645021, 1907641, 2200521, 2525901, 2886101, 3283521
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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S. Mukai, An Introduction to Invariants and Moduli, Cambridge, 2003; see p. 483.
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FORMULA
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a(n)= 1+ (n^2+n)* (n^2+n+1)* 10/3 . a(-1-n)= a(n). - Michael Somos, Mar 20 2007
G.f.: (1+ 16*x +46*x^2 +16*x^3 +x^4)/ (1-x^5). - Michael Somos, Mar 20 2007
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PROGRAM
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(PARI) {a(n)= 1+ (n^2+n)* (n^2+n+1)* 10/3} /* Michael Somos Mar 20 2007 */
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CROSSREFS
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Sequence in context: A125331 A126489 A033595 this_sequence A003702 A101645 A060493
Adjacent sequences: A107728 A107729 A107730 this_sequence A107732 A107733 A107734
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KEYWORD
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nonn
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AUTHOR
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njas, Jun 10 2005
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EXTENSIONS
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More terms from Michael Somos, Mar 20 2007
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