Number of n X 2 0..1 arrays with no element equal to more than two horizontal or vertical neighbors, with new values 0..1 introduced in row major order.
A240478
Number of n X 2 0..1 arrays with no element equal to more than two horizontal or vertical neighbors, with new values 0..1 introduced in row major order.
Terms
- a(0) =2a(1) =8a(2) =25a(3) =81a(4) =264a(5) =857a(6) =2785a(7) =9050a(8) =29407a(9) =95557a(10) =310508a(11) =1008981a(12) =3278637a(13) =10653778a(14) =34618955a(15) =112492681a(16) =365539724a(17) =1187804297a(18) =3859714705a(19) =12541963050a(20) =40754524407a(21) =132429927677a(22) =430324878028
External references
- oeis: A240478