One quarter the number of nX9 1..4 arrays with no two neighbors of any element equal to each other.
A183361
One quarter the number of nX9 1..4 arrays with no two neighbors of any element equal to each other.
Terms
- a(0) =8748a(1) =589824a(2) =314928a(3) =435600a(4) =802944a(5) =1679616a(6) =3852288a(7) =9437184a(8) =23003136a(9) =47775744a(10) =95551488a(11) =191102976a(12) =389283840a(13) =807469056a(14) =1695744000a(15) =3588489216a(16) =7596343296a(17) =16057958400a(18) =33888927744a(19) =71430045696a(20) =150473539584
External references
- oeis: A183361