Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280549
Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =0a(1) =9a(2) =50a(3) =144a(4) =325a(5) =670a(6) =1316a(7) =2502a(8) =4654a(9) =8521a(10) =15412a(11) =27612a(12) =49085a(13) =86695a(14) =152282a(15) =266222a(16) =463487a(17) =803970a(18) =1390026a(19) =2396244a(20) =4119894a(21) =7066303a(22) =12093158a(23) =20654128a(24) =35209707a(25) =59919341a(26) =101806274a(27) =172716156a(28) =292607401a(29) =495074182
External references
- oeis: A280549