Number of 2n X 2 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
A198447
Number of 2n X 2 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =3a(1) =13a(2) =71a(3) =433a(4) =2763a(5) =17941a(6) =117263a(7) =768313a(8) =5038611a(9) =33054493a(10) =216872663a(11) =1422982081a(12) =9336876123a(13) =61264171813a(14) =401987528351
External references
- oeis: A198447