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

A281394

Number of n X 2 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal 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) =6a(3) =36a(4) =160a(5) =676a(6) =2692a(7) =10352a(8) =38868a(9) =143276a(10) =520736a(11) =1871380a(12) =6663484a(13) =23545568a(14) =82661076a(15) =288590204a(16) =1002706896a(17) =3469289876a(18) =11959062188a(19) =41088781264a(20) =140757051348a(21) =480912678028

External references