A024505 a (n) = [C (2 n, n)/2^(n + 2)].

0, 0, 0, 0, 1, 1, 3, 6, 12, 23, 45, 86, 165, 317, 612, 1183, 2292, 4451, 8654, 16853, 32865, 64165, 125414, 245375, 480526, 941832, 1847440, 3626457, 7123398, 14001162, 27535618, 54182991, 106672764, 210113021, 414046247, 816262602

Offset

0,7

Links

Table of n, a(n) for n=0..35.

Mathematica

Table[Floor[(Binomial[2n, n])/2^(n+2)], {n, 0, 40}] (* Harvey P. Dale, Aug 04 2020 *)

Crossrefs

Sequence in context: A341580 A050243 A285262 * A005256 A097979 A215983

Adjacent sequences: A024502 A024503 A024504 * A024506 A024507 A024508

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from James A. Sellers, Feb 06 2000

Status

approved