A091611 Column 1 of triangle A091604.
1, 2, 4, 6, 10, 17, 25, 38, 57, 84, 120, 174, 243, 342, 472, 650, 882, 1200, 1605, 2150, 2848, 3767, 4937, 6467, 8396, 10891, 14032, 18046, 23073, 29458, 37405, 47421, 59850, 75396, 94601, 118501, 147888, 184254, 228823, 283677, 350655, 432737
Offset: 1