Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, southwest or southeast neighbor modulo 4 and the upper left element equal to 0.
A266923
Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, southwest or southeast neighbor modulo 4 and the upper left element equal to 0.
Terms
- a(0) =2a(1) =23a(2) =376a(3) =7137a(4) =147378a(5) =3267167a(6) =75854154a(7) =1829256370a(8) =45273247748
External references
- oeis: A266923