A181225 Number of length 2n sequences p(i=0..2n-1) with 0<=p(i)<=i and having exactly n maxima.

2, 3, 26, 476, 14905, 708825, 47514180, 4264132468, 493337571005, 71476985762027, 12673922434134249, 2699365743596908540, 679965250748621333815, 199945129785484988046467, 67870868805277105224767736, 26339649115669349922436689846, 11588494978121881119811952503395

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n=1..135.

Formula

a(n) = A181229(2n,n).

Crossrefs

Cf. A181229.

Sequence in context: A178196 A258766 A056722 * A143876 A184506 A126203

Adjacent sequences: A181222 A181223 A181224 * A181226 A181227 A181228

Keyword

nonn

Author

R. H. Hardin, Oct 10 2010

Status

approved