Triangle read by rows: T(n,k) is the number of ternary words (i.e., finite sequences of 0's, 1's and 2's) of length n having k occurrences of 01's (0 <= k <= floor(n/2)).
A181371
Triangle read by rows: T(n,k) is the number of ternary words (i.e., finite sequences of 0's, 1's and 2's) of length n having k occurrences of 01's (0 <= k <= floor(n/2)).
Terms
- a(0) =1a(1) =3a(2) =8a(3) =1a(4) =21a(5) =6a(6) =55a(7) =25a(8) =1a(9) =144a(10) =90a(11) =9a(12) =377a(13) =300a(14) =51a(15) =1a(16) =987a(17) =954a(18) =234a(19) =12a(20) =2584a(21) =2939a(22) =951a(23) =86a(24) =1a(25) =6765a(26) =8850a(27) =3573a(28) =480a(29) =15
External references
- oeis: A181371