Number of nX2 0..1 arrays with no element equal to more than three of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281159

Number of nX2 0..1 arrays with no element equal to more than three 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) =5a(3) =18a(4) =85a(5) =346a(6) =1388a(7) =5454a(8) =21171a(9) =81250a(10) =309019a(11) =1166316a(12) =4372916a(13) =16300940a(14) =60456037a(15) =223201490a(16) =820709441a(17) =3006697550a(18) =10978569420a(19) =39965443098a(20) =145083078903a(21) =525337769138

External references