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A085474
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C(2*n+4,4)-C(2*n,4).
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3
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1, 15, 69, 195, 425, 791, 1325, 2059, 3025, 4255, 5781, 7635, 9849, 12455, 15485, 18971, 22945, 27439, 32485, 38115, 44361, 51255, 58829, 67115, 76145, 85951, 96565, 108019, 120345, 133575, 147741, 162875, 179009, 196175, 214405, 233731
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1 + 11*x + 15*x^2 + 5*x^3)/(1-x)^4.
a(n) = (16*n^3 + 12*n^2 + 14*n + 3)/3.
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MAPLE
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MATHEMATICA
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LinearRecurrence[{4, -6, 4, -1}, {1, 15, 69, 195}, 40] (* Harvey P. Dale, Nov 10 2017 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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