Number of nX2 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
A199143
Number of nX2 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =65a(4) =393a(5) =2539a(6) =16866a(7) =113432a(8) =766473a(9) =5188597a(10) =35148945a(11) =238173743a(12) =1614066774a(13) =10938730576a(14) =74134306725a(15) =502428413393
External references
- oeis: A199143