Number of length n+3 0..2 arrays with some pair in every consecutive four terms totalling exactly 2.

A245945

Number of length n+3 0..2 arrays with some pair in every consecutive four terms totalling exactly 2.

Terms

    a(0) =71a(1) =197a(2) =545a(3) =1501a(4) =4145a(5) =11441a(6) =31577a(7) =87161a(8) =240581a(9) =664051a(10) =1832917a(11) =5059221a(12) =13964475a(13) =38544783a(14) =106391413a(15) =293661867a(16) =810566283a(17) =2237327253a(18) =6175476757a(19) =17045567707a(20) =47049222251a(21) =129865390965a(22) =358454804639a(23) =989407924729

External references