One quarter the number of n X 4 1..4 arrays with no two neighbors of any element equal to each other.
A183356
One quarter the number of n X 4 1..4 arrays with no two neighbors of any element equal to each other.
Terms
- a(0) =36a(1) =576a(2) =1296a(3) =3600a(4) =9216a(5) =24336a(6) =63504a(7) =166464a(8) =435600a(9) =1140624a(10) =2985984a(11) =7817616a(12) =20466576a(13) =53582400a(14) =140280336a(15) =367258896a(16) =961496064a(17) =2517229584a(18) =6590192400a(19) =17253347904a(20) =45169851024a(21) =118256205456a(22) =309598765056a(23) =810540090000
External references
- oeis: A183356