A295445 a(n) = (18*n)!*(2*n)!/((9*n)!*(6*n)!*(5*n)!).

1, 408408, 802241960520, 1823169705017624880, 4396944340992842923469640, 10954213672604884898541157653408, 27856219773497860095974794307896603536, 71846723613356502547294848257330357588794200, 187234481335648875117449455455153824826269008835400

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Formula

G.f.: hypergeom([1/18, 5/18, 7/18, 1/2, 11/18, 13/18, 17/18], [1/5, 1/3, 2/5, 3/5, 2/3, 4/5], 8707129344/3125*x).

Crossrefs

Cf. A295431.

Sequence in context: A043609 A220988 A357909 * A183705 A233995 A182116

Adjacent sequences: A295442 A295443 A295444 * A295446 A295447 A295448

Keyword

nonn

Author

Gheorghe Coserea, Nov 27 2017

Status

approved