Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
A267903
Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
Terms
- a(0) =0a(1) =6a(2) =20a(3) =268a(4) =2324a(5) =28318a(6) =315196a(7) =3786836a(8) =45099306a(9) =547824556a(10) =6687936028a(11) =82350672500
External references
- oeis: A267903