Summed lengths of all nonintersecting rook paths on a 3 x n board.

A181394

Summed lengths of all nonintersecting rook paths on a 3 x n board.

Terms

    a(0) =2a(1) =14a(2) =64a(3) =284a(4) =1206a(5) =4882a(6) =19060a(7) =72588a(8) =271548a(9) =1001964a(10) =3656480a(11) =13223348a(12) =47461350a(13) =169263658a(14) =600355808a(15) =2119297852a(16) =7450253362a(17) =26095036854a(18) =91102304600a(19) =317127751352

External references