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A133203
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a(n)=a(n-1)+8*n+4, n>2.
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0
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0, 1, 3, 31, 67, 111, 163, 223, 291, 367, 451, 543, 643, 751, 867, 991, 1123, 1263, 1411, 1567, 1731, 1903, 2083, 2271, 2467, 2671, 2883, 3103, 3331, 3567, 3811, 4063, 4323, 4591, 4867, 5151, 5443, 5743, 6051, 6367
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Apart from {0,1} at the start, 15 of the first 30 are primes.
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FORMULA
| G.f.: x(1+25x^2-18x^3)/(1-x)^3. a(n)=4n^2+8n-29, n>1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2008
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EXAMPLE
| fz(1)=0; fz(2)=1; fz(3)=3;
for k=4:n
fz(k)=fz(k-1)+8*k+4;
end
y=fz(n);
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PROG
| MatLab program: function y=fib(n)
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CROSSREFS
| Sequence in context: A141966 A050833 A041207 * A062616 A031916 A137185
Adjacent sequences: A133200 A133201 A133202 * A133204 A133205 A133206
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KEYWORD
| nonn
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AUTHOR
| Matt Wynne (mattwyn(AT)verizon.net), Aug 27 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2008
Constraint on n added to the definition by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 23 2009
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