A114252 a(n) = C(4+2*n,4+n)*C(9+2*n,0+n).

1, 66, 2184, 54600, 1178100, 23279256, 434546112, 7801876368, 136246002750, 2331320491500, 39283977292560, 654191853260400, 10794165578796600, 176805993477330000, 2879098129810080000, 46660583690455363200, 753276797952788769660, 12121801610494996922040

Offset: 0

Author

Zerinvary Lajos, Feb 04 2006

Keywords

• easy
• nonn
• changed

Crossrefs

Cf. A002694, A030054, A062190.

Programs

Mathematica

Table[Binomial[4+2n,4+n]Binomial[9+2n,n],{n,0,20}] (* Harvey P. Dale, Aug 30 2015 *)

Formula

From Amiram Eldar, Sep 06 2025: (Start)

a(n) = A002694(n+2) * A030054(n+4).

a(n) ~ 2^(4*n+13) / (Pi*n). (End)

Extensions

More terms from Harvey P. Dale, Aug 30 2015