T(n,k)=Number of nXk 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A203846
T(n,k)=Number of nXk 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =16a(8) =16a(9) =1a(10) =1a(11) =50a(12) =262a(13) =50a(14) =1a(15) =1a(16) =184a(17) =2706a(18) =2706a(19) =184a(20) =1a(21) =1a(22) =810a(23) =28744a(24) =84346a(25) =28744a(26) =810a(27) =1a(28) =1a(29) =3502
External references
- oeis: A203846