A023654 Convolution of (F(2), F(3), F(4), ...) and A001950.
2, 9, 23, 49, 95, 172, 300, 510, 853, 1412, 2319, 3790, 6174, 10034, 16283, 26397, 42765, 69253, 112114, 181468, 293688, 475267, 769072, 1244461, 2013660, 3258254, 5272052, 8530449
Offset: 1