Number of n X 1 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

A280279

Number of n X 1 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =8a(5) =28a(6) =94a(7) =304a(8) =960a(9) =2976a(10) =9096a(11) =27488a(12) =82304a(13) =244544a(14) =721888a(15) =2119168a(16) =6191104a(17) =18011136a(18) =52203648a(19) =150809088a(20) =434382848a(21) =1247857664a(22) =3576143360a(23) =10226274304a(24) =29184704512a(25) =83138240512a(26) =236438194176a(27) =671370043392

External references