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1, 0, 1, 9, 4, 25, 49, 16, 81, 121, 36, 169, 225, 64, 289, 361, 100, 441, 529, 144, 625, 729, 196, 841, 961, 256, 1089, 1225, 324, 1369, 1521, 400, 1681, 1849, 484, 2025, 2209, 576, 2401, 2601, 676, 2809, 3025, 784, 3249, 3481, 900, 3721, 3969, 1024, 4225, 4489, 1156, 4761, 5041, 1296, 5329
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OFFSET
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1,4
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COMMENTS
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A permutation of the squared A023443, or -- if a(1) is discarded to avoid duplication -- of A000290.
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LINKS
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Table of n, a(n) for n=1..57.
Index entries for linear recurrences with constant coefficients, signature (0,0,3,0,0,-3,0,0,1).
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FORMULA
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a(n)= +3*a(n-3) -3*a(n-6) +a(n-9).
G.f.: -x*(1+x^2+6*x^3+4*x^4+22*x^5+25*x^6+4*x^7+9*x^8) / ( (x-1)^3*(1+x+x^2)^3 ).
a(3n+2) = A016742(n). a(3n) = A016754(2n). a(3n+1) = A016754(2n-1).
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CROSSREFS
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Sequence in context: A317739 A174679 A168077 * A014717 A104728 A058093
Adjacent sequences: A173533 A173534 A173535 * A173537 A173538 A173539
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz, Nov 23 2010
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STATUS
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approved
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