Number of n X 3 array permutations with each element not moving, or moving one space N, SW or SE.
A189429
Number of n X 3 array permutations with each element not moving, or moving one space N, SW or SE.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =31a(4) =109a(5) =367a(6) =1245a(7) =4247a(8) =14453a(9) =49167a(10) =167325a(11) =569447a(12) =1937829a(13) =6594495a(14) =22441517a(15) =76369751a(16) =259890293a(17) =884421039a(18) =3009733885a(19) =10242290119a(20) =34855077573a(21) =118613751711a(22) =403649138125
External references
- oeis: A189429