Number of length n+3 0..4 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..4 introduced in 0..4 order.
A242580
Number of length n+3 0..4 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..4 introduced in 0..4 order.
Terms
- a(0) =14a(1) =46a(2) =174a(3) =723a(4) =3192a(5) =14648a(6) =68819a(7) =327821a(8) =1574161a(9) =7594177a(10) =36734890a(11) =177970751a(12) =862989003a(13) =4186822990a(14) =20318525824a(15) =98621961836a(16) =478737668736
External references
- oeis: A242580