Number of length n+2 0..3 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..3 introduced in 0..3 order.
A243722
Number of length n+2 0..3 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..3 introduced in 0..3 order.
Terms
- a(0) =3a(1) =6a(2) =12a(3) =25a(4) =53a(5) =115a(6) =253a(7) =564a(8) =1268a(9) =2871a(10) =6531a(11) =14911a(12) =34127a(13) =78250a(14) =179644a(15) =412797a(16) =949145a(17) =2183355a(18) =5024025a(19) =11563144a(20) =26617508a(21) =61278283a(22) =141084439a(23) =324844263a(24) =747976187a(25) =1722312558a(26) =3965923308a(27) =9132346753a(28) =21029284637a(29) =48424978627
External references
- oeis: A243722