Triangle read by rows: T(n,k) is the number of words over alphabet {0,1,2,3} having exactly k occurrences of the string 01, where n>=0 and k>=0.
A261711
Triangle read by rows: T(n,k) is the number of words over alphabet {0,1,2,3} having exactly k occurrences of the string 01, where n>=0 and k>=0.
Terms
- a(0) =1a(1) =4a(2) =15a(3) =1a(4) =56a(5) =8a(6) =209a(7) =46a(8) =1a(9) =780a(10) =232a(11) =12a(12) =2911a(13) =1091a(14) =93a(15) =1a(16) =10864a(17) =4912a(18) =592a(19) =16a(20) =40545a(21) =21468a(22) =3366a(23) =156a(24) =1a(25) =151316a(26) =91824a(27) =17784a(28) =1200a(29) =20
External references
- oeis: A261711