Number of nonintersecting (or self-avoiding) rook paths joining opposite corners of 3 X n board.

A006192

Number of nonintersecting (or self-avoiding) rook paths joining opposite corners of 3 X n board.

Terms

    a(0) =1a(1) =4a(2) =12a(3) =38a(4) =125a(5) =414a(6) =1369a(7) =4522a(8) =14934a(9) =49322a(10) =162899a(11) =538020a(12) =1776961a(13) =5868904a(14) =19383672a(15) =64019918a(16) =211443425a(17) =698350194a(18) =2306494009a(19) =7617832222a(20) =25159990674a(21) =83097804242a(22) =274453403399a(23) =906458014440

External references