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A114059
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a(n) = binomial(3+2*n, n) * binomial(8+2*n, 3+n).
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1
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56, 1050, 16632, 252252, 3775200, 56316546, 840639800, 12575971408, 188663555808, 2838687761000, 42836302222560, 648207031545000, 9834444563299200, 149569451148798450, 2279905857066915000, 34825702701626575200, 532997250488883180000, 8172044956118671828200
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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a(0) = C(3+2*0,0)*C(8+2*0,3+0) = C(3,0)*C(8,3) = 1*56 = 56.
a(10) = C(3+2*10,10)*C(8+2*10,3+10) = C(23,10)*C(28,13) = 1144066*37442160 = 42836302222560.
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PROG
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(PARI) a(n)={binomial(3+2*n, n) * binomial(8+2*n, 3+n)} \\ Andrew Howroyd, Jan 07 2020
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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Name edited and terms a(11) and beyond from Andrew Howroyd, Jan 07 2020
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STATUS
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approved
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