A133551 Number of length n binary sequences with at most 3 of every 6 adjacent bits set.

1, 2, 4, 8, 15, 26, 42, 74, 132, 236, 421, 747, 1314, 2318, 4101, 7263, 12864, 22773, 40291, 71272, 126099, 223144, 394895, 698823, 1236609, 2188185, 3872000, 6851631, 12124307, 21454602, 37964931, 67180507, 118878510, 210360283