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A152103
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Quartic product sequence: m = 2; l = 4; a(n)=2^n*Product[1 + m*Cos[k*Pi/n]^2 + l*Cos[k*Pi/n]^4, {k, 1, (n - 1)/2}].
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0
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1, 2, 4, 14, 48, 158, 532, 1778, 5952, 19922, 66676, 223166, 746928, 2499950, 8367268, 28005026, 93732096, 313718882, 1050008932, 3514352558, 11762446512, 39368602238, 131765686708, 441016322834, 1476070150464, 4940368363442
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| m = 2; l = 4; a(n)=2^n*Product[1 + m*Cos[k*Pi/n]^2 + l*Cos[k*Pi/n]^4, {k, 1, (n - 1)/2}].
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MATHEMATICA
| m = 2; l = 4; b = Table[2^n*Product[1 + m*Cos[k*Pi/n]^2 + l*Cos[k*Pi/n]^4, {k, 1, (n - 1)/2}], {n, 0, 30}]; FullSimplify[ExpandAll[%]] Round[b]
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CROSSREFS
| Sequence in context: A062868 A054936 A006443 * A102879 A032312 A032222
Adjacent sequences: A152100 A152101 A152102 * A152104 A152105 A152106
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KEYWORD
| nonn
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Nov 24 2008
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