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A145287
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a(n) = number of monomials in n-th power of polynomial x^5+x^4+x^3+x^2+x+1
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0
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6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76, 81, 86, 91, 96, 101, 106, 111, 116, 121, 126, 131, 136, 141, 146, 151, 156, 161, 166, 171, 176, 181, 186, 191, 196, 201, 206, 211, 216, 221, 226, 231, 236, 241, 246, 251, 256, 261, 266, 271, 276, 281
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n)=Length[(x^5+x^4+x^3+x^2+x+1)^n]
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FORMULA
| a(n)= 5n+1 = A016861(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 11 2008]
a(n)=10*n-a(n-1)-3 (with a(1)=6) [From Vincenzo Librandi, Nov 25 2010]
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MATHEMATICA
| a = {}; k = x^5 + x^4 + x^3 + x^2 + x + 1; m = k; Do[AppendTo[a, Length[m]]; m = Expand[m*k], {n, 1, 100}]; a (*Artur Jasinski*)
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CROSSREFS
| Sequence in context: A080900 A080783 A016861 * A140232 A184487 A085813
Adjacent sequences: A145284 A145285 A145286 * A145288 A145289 A145290
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Oct 06 2008
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