A065738 Largest square <= binomial(2n,n).

1, 4, 16, 64, 225, 900, 3364, 12769, 48400, 184041, 703921, 2702736, 10394176, 40106889, 155102116, 601034256, 2333566249, 9075039169, 35345128009, 137845868176, 538256995600, 2104098203601, 8233427666025, 32247599617809

Offset: 1

Author

Labos Elemer, Nov 15 2001

Keywords

• easy
• nonn

Links

• Harry J. Smith, Table of n, a(n) for n = 1..200

Crossrefs

Cf. A048760, A000984, A065730-A065741.

Programs

PARI

a(n) = { sqrtint(binomial(2*n, n))^2 } \\ Harry J. Smith, Oct 29 2009

Formula

a(n) = A048760(A000984(n)).

Extensions

Terms corrected and extended by Harry J. Smith, Oct 29 2009