Number of n X 2 0..1 arrays with no element equal to more than four of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281930

Number of n X 2 0..1 arrays with no element equal to more than four of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =6a(4) =33a(5) =166a(6) =792a(7) =3654a(8) =16455a(9) =72774a(10) =317367a(11) =1368608a(12) =5848140a(13) =24799548a(14) =104488541a(15) =437818374a(16) =1825747245a(17) =7581746154a(18) =31368531456a(19) =129358242306a(20) =531886946515

External references