T(n,k)=1/6 the number of nXk 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185540
T(n,k)=1/6 the number of nXk 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =1a(4) =11a(5) =1a(6) =6a(7) =110a(8) =110a(9) =6a(10) =11a(11) =1155a(12) =2990a(13) =1155a(14) =11a(15) =41a(16) =12105a(17) =127570a(18) =127570a(19) =12105a(20) =41a(21) =96a(22) =127190a(23) =4403225a(24) =17526450a(25) =4403225a(26) =127190a(27) =96a(28) =301a(29) =1336205
External references
- oeis: A185540