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Search: id:A014606
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| 1, 1, 20, 1680, 369600, 168168000, 137225088000, 182509367040000, 369398958888960000, 1080491954750208000000, 4386797336285844480000000, 23934366266775567482880000000, 170891375144777551827763200000000
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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a(n) is also the constant term in the product : product 1 <= i,j <= n, i different from j (1 - x_i/x_j)^3. - Sharon Sela (sharonsela(AT)hotmail.com), Feb 14 2002
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REFERENCES
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G. E. Andrews, R. Askey and R. Roy, Special Functions, Cambridge University Press, 1998.
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PROGRAM
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(PARI) a(n)=if(n<0, 0, (3*n)!/6^n)
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CROSSREFS
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Cf. A000680.
Sequence in context: A127847 A130040 A094035 this_sequence A072818 A123479 A071152
Adjacent sequences: A014603 A014604 A014605 this_sequence A014607 A014608 A014609
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KEYWORD
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nonn
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AUTHOR
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BjornE (mdeans(AT)algonet.se)
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