Number of n X 3 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.
A164749
Number of n X 3 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) =8a(1) =108a(2) =730a(3) =3576a(4) =14414a(5) =50928a(6) =163722a(7) =490496a(8) =1391862a(9) =3784168a(10) =9940066a(11) =25384568a(12) =63327166a(13) =154906432a(14) =372640634a(15) =883653200a(16) =2069574918a(17) =4794856504a(18) =11003621330a(19) =25040248584a(20) =56557140046a(21) =126889144656a(22) =282971569898
External references
- oeis: A164749