Triangle read by rows: T(n,k) is the number of sequences of length n on the alphabet {0,1,2,3}, containing k subsequences 00 (0<=k<=n-1).
A128235
Triangle read by rows: T(n,k) is the number of sequences of length n on the alphabet {0,1,2,3}, containing k subsequences 00 (0<=k<=n-1).
Terms
- a(0) =1a(1) =4a(2) =15a(3) =1a(4) =57a(5) =6a(6) =1a(7) =216a(8) =33a(9) =6a(10) =1a(11) =819a(12) =162a(13) =36a(14) =6a(15) =1a(16) =3105a(17) =756a(18) =189a(19) =39a(20) =6a(21) =1a(22) =11772a(23) =3402a(24) =945a(25) =216a(26) =42a(27) =6a(28) =1a(29) =44631
External references
- oeis: A128235