A026089 a(n) = T(2n,n), where T is the array defined in A026082.
1, 2, 4, 16, 93, 518, 2932, 16709, 95849, 552749, 3201848, 18616751, 108592239, 635175153, 3724193120, 21881993115, 128810517855, 759515272026, 4485048436792, 26520334731436, 157006248094198
Offset: 0
Keywords
Crossrefs
Bisection of A026094.