Number of length n+4 0..2 arrays with some pair in every consecutive five terms totalling exactly 2.
A246886
Number of length n+4 0..2 arrays with some pair in every consecutive five terms totalling exactly 2.
Terms
- a(0) =231a(1) =673a(2) =1961a(3) =5711a(4) =16621a(5) =48393a(6) =140893a(7) =410197a(8) =1194243a(9) =3476929a(10) =10122747a(11) =29471409a(12) =85803183a(13) =249807769a(14) =727291431a(15) =2117439451a(16) =6164722475a(17) =17947999987a(18) =52253885667a(19) =152132191293a(20) =442918327175
External references
- oeis: A246886