Number of 4 X n array permutations with each element not moving, or moving one space N, SW or SE.
A189436
Number of 4 X n array permutations with each element not moving, or moving one space N, SW or SE.
Terms
- a(0) =1a(1) =9a(2) =31a(3) =140a(4) =571a(5) =2413a(6) =10069a(7) =42205a(8) =176624a(9) =739573a(10) =3096173a(11) =12962845a(12) =54270579a(13) =227212636a(14) =951259751a(15) =3982596009a(16) =16673747193a(17) =69807202249a(18) =292258553696
External references
- oeis: A189436