Number of horizontal, vertical and diagonal neighbor colorings of the odd squares of an nX2 array with new integer colors introduced in row major order.

A216025

Number of horizontal, vertical and diagonal neighbor colorings of the odd squares of an nX2 array with new integer colors introduced in row major order.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =5a(4) =12a(5) =42a(6) =136a(7) =602a(8) =2440a(9) =12840a(10) =61912a(11) =373780a(12) =2075312a(13) =14050312a(14) =87852160a(15) =656404264a(16) =4548247264a(17) =37060650272a(18) =281121815712

External references