T(n,k)=1/8 the number of nXk 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185903
T(n,k)=1/8 the number of nXk 0..7 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) =15a(5) =1a(6) =8a(7) =196a(8) =196a(9) =8a(10) =15a(11) =2765a(12) =7854a(13) =2765a(14) =15a(15) =71a(16) =38731a(17) =546280a(18) =546280a(19) =38731a(20) =71a(21) =176a(22) =545328a(23) =28967421a(24) =139230658a(25) =28967421a(26) =545328a(27) =176a(28) =673a(29) =7675381
External references
- oeis: A185903