Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to or 1 greater than any west or northeast neighbors modulo n and the upper left element equal to 0.

A267738

Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to or 1 greater than any west or northeast neighbors modulo n and the upper left element equal to 0.

Terms

    a(0) =1a(1) =35a(2) =57a(3) =123a(4) =249a(5) =502a(6) =1008a(7) =2020a(8) =4044a(9) =8092a(10) =16188a(11) =32380a(12) =64764a(13) =129532a(14) =259068a(15) =518140a(16) =1036284a(17) =2072572a(18) =4145148a(19) =8290300a(20) =16580604a(21) =33161212a(22) =66322428a(23) =132644860a(24) =265289724a(25) =530579452a(26) =1061158908a(27) =2122317820a(28) =4244635644

External references