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A295471
a(n) = (20*n)!*n!/((10*n)!*(8*n)!*(3*n)!).
2
1, 2771340, 44524428808860, 835982760936614190900, 16702642470437308383606668060, 345116202503279265243707597937393840, 7282855378270617096441349556073829143864900, 155927544469969434644890704895476696960247603510200
OFFSET
0,2
FORMULA
G.f.: hypergeom([1/20, 3/20, 7/20, 9/20, 11/20, 13/20, 17/20, 19/20], [1/8, 1/3, 3/8, 1/2, 5/8, 2/3, 7/8], 625000000/27*x).
MATHEMATICA
Table[((20n)!n!)/((10n)!(8n)!(3n)!), {n, 0, 10}] (* Harvey P. Dale, Feb 03 2021 *)
CROSSREFS
Cf. A295431.
Sequence in context: A306634 A015336 A251835 * A316487 A250535 A203912
KEYWORD
nonn
AUTHOR
Gheorghe Coserea, Nov 28 2017
STATUS
approved