Number of nX4 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, and 4 in the lower right corner.
A164750
Number of nX4 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, and 4 in the lower right corner.
Terms
- a(0) =33a(1) =730a(2) =8181a(3) =66970a(4) =454001a(5) =2710440a(6) =14765875a(7) =75078360a(8) =361767973a(9) =1669896490a(10) =7442607455a(11) =32219919102a(12) =136108600539a(13) =563096090012
External references
- oeis: A164750