A026902 a(n) = T(n,m) + T(n,m+1) + ... + T(n,n), m=[ (n+1)/2 ], T given by A026780.
1, 1, 4, 5, 18, 24, 84, 115, 400, 554, 1934, 2690, 9474, 13180, 46962, 65193, 235338, 325568, 1191292, 1641192, 6086880, 8348342, 31369180, 42831204, 162943236, 221515918, 852512496, 1154208486, 4489722568, 6055426942
Offset: 1