A114201 C(1+2*n,1+n)*C(6+2*n,0+n)

1, 24, 450, 7700, 126126, 2018016, 31855824, 498841200, 7773608700, 120784604512, 1873533922260, 29034766346040, 449790717967500, 6967723880880000, 107959904588606400, 1673378521123399200, 25949671331244477300, 402629171550425820000, 6250759024406391495000

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Example

if n=0 then C(1+2*0,1+0)*C(6+2*0,0+0)=C(1,1)*C(6,0)=1*1=1
if n=10 then C(1+2*n,1+n)*C(6+2*n,0+n)=C(21,11)*C(26,10)=352716*5311735=1873533922260

Mathematica

Table[Binomial[2n+1, n+1]Binomial[2n+6, n], {n, 0, 20}] (* Harvey P. Dale, Jun 08 2013 *)

Crossrefs

Sequence in context: A187625 A024303 A060195 * A263476 A263470 A276816

Adjacent sequences: A114198 A114199 A114200 * A114202 A114203 A114204

Keyword

easy,nonn

Author

Zerinvary Lajos, Feb 04 2006

Extensions

More terms from Harvey P. Dale, Jun 08 2013

Status

approved