Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 1 1 vertically.
A207840
Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 1 1 vertically.
Terms
- a(0) =6a(1) =36a(2) =72a(3) =240a(4) =704a(5) =2080a(6) =6216a(7) =18496a(8) =55000a(9) =163760a(10) =487296a(11) =1450192a(12) =4315896a(13) =12844160a(14) =38224536a(15) =113757504a(16) =338545344a(17) =1007520656a(18) =2998410360a(19) =8923354336a(20) =26556156776a(21) =79031879392a(22) =235201123584a(23) =699965244000
External references
- oeis: A207840