Number of n X 1 0..7 arrays with no element equal to another at a city block distance of exactly two, and new values 0..7 introduced in row major order.
A222890
Number of n X 1 0..7 arrays with no element equal to another at a city block distance of exactly two, and new values 0..7 introduced in row major order.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =7a(4) =20a(5) =67a(6) =255a(7) =1080a(8) =5016a(9) =25249a(10) =136289a(11) =780658a(12) =4696002a(13) =29374011a(14) =189373083a(15) =1248978556a(16) =8376922028a(17) =56874440053a(18) =389553674037
External references
- oeis: A222890