A026680 Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026670.
1, 1, 2, 4, 6, 10, 19, 29, 48, 88, 136, 224, 403, 627, 1030, 1830, 2860, 4690, 8257, 12947, 21204, 37068, 58272, 95340, 165723, 261063, 426786, 738352, 1165138, 1903490, 3279891, 5183381, 8463272, 14532484, 22995756, 37528240
Offset: 0