Number of n X 2 0..1 arrays with no element unequal to more than four of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A283660
Number of n X 2 0..1 arrays with no element unequal to more than four of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =40a(6) =264a(7) =1504a(8) =7936a(9) =39744a(10) =191552a(11) =896768a(12) =4103616a(13) =18434944a(14) =81563008a(15) =356264448a(16) =1539203584a(17) =6587355136a(18) =27960152064a(19) =117817262080a(20) =493257806848
External references
- oeis: A283660