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0, 1, 16, 9, 64, 25, 144, 49, 256, 81, 400, 121, 576, 169, 784, 225, 1024, 289, 1296, 361, 1600, 441, 1936, 529, 2304, 625, 2704, 729, 3136, 841, 3600, 961, 4096, 1089, 4624, 1225, 5184, 1369, 5776, 1521, 6400, 1681, 7056, 1849, 7744, 2025, 8464, 2209, 9216
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The sequence can be obtained by re-ordering A000290 and deleting squares of the form A130824(k)^2.
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FORMULA
| Denominator of 1/4-1/(2n)^2, if n>0.
a(2n+1) = A016754(n). a(2n) = 16*A000290(n).
a(n) = A061038(2*n) (bisection).
a(n) = 3*a(n-2)-3*a(n-4)+a(n-6). G.f.: x*(1+16*x+6*x^2+16*x^3+x^4)/((1-x)^3*(1+x)^3).
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CROSSREFS
| Sequence in context: A070567 A070688 A103167 * A040242 A070578 A028695
Adjacent sequences: A154612 A154613 A154614 * A154616 A154617 A154618
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KEYWORD
| nonn,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Jan 13 2009
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EXTENSIONS
| Edited, offset set to 1, and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 07 2009
a(0) added Oct 21 2009
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