Number of n X 2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops.
A221236
Number of n X 2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops.
Terms
- a(0) =0a(1) =5a(2) =53a(3) =467a(4) =3913a(5) =32299a(6) =265353a(7) =2176758a(8) =17847997a(9) =146319703a(10) =1199485661a(11) =9832876386a(12) =80605364957a(13) =660764392260
External references
- oeis: A221236