Number of nX3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.
A230894
Number of nX3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =14a(3) =34a(4) =198a(5) =810a(6) =3706a(7) =16918a(8) =76318a(9) =347442a(10) =1575090a(11) =7148582a(12) =32438126a(13) =147179442a(14) =667843250a(15) =3030291798a(16) =13749921166a(17) =62390019330a(18) =283093420626
External references
- oeis: A230894