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A132689
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a(n) = binomial(2^n + 3*n + 1, n).
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13
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1, 6, 55, 816, 23751, 1712304, 377447148, 294109729200, 871896500955975, 10061777828754031380, 451004941990890693018405, 77739225019650285306412710240, 51039474754930845750609669420261300
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = [x^n] 1/(1-x)^(2^n + 2*n + 2).
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MAPLE
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MATHEMATICA
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PROG
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(PARI) a(n)=binomial(2^n+3*n+1, n)
(Magma) [Binomial(2^n+3*n+1, n) : n in [0..15]]; // Wesley Ivan Hurt, Nov 20 2014
(Sage) [binomial(2^n +3*n+1, n) for n in (0..15)] # G. C. Greubel, Feb 15 2021
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CROSSREFS
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Sequences of the form binomial(2^n +p*n +q, n): A136556 (0,-1), A014070 (0,0), A136505 (0,1), A136506 (0,2), A060690 (1,-1), A132683 (1,0), A132684 (1,1), A132685 (2,0), A132686 (2,1), A132687 (3,-1), A132688 (3,0), this sequence (3,1).
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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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