Number of n X 2 0..1 arrays with every element equal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
A297945
Number of n X 2 0..1 arrays with every element equal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =52a(4) =174a(5) =604a(6) =2048a(7) =6948a(8) =23652a(9) =80488a(10) =273840a(11) =931808a(12) =3170824a(13) =10789824a(14) =36716272a(15) =124940880a(16) =425158448a(17) =1446762336a(18) =4923157280a(19) =16752910976a(20) =57008139808a(21) =193991844032a(22) =660130925440
External references
- oeis: A297945