Triangular array read by rows: T(n,k) is the number of compositions of n that have exactly k 3's; n>=0, 0<=k<=floor(n/3).

A218796

Triangular array read by rows: T(n,k) is the number of compositions of n that have exactly k 3's; n>=0, 0<=k<=floor(n/3).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =1a(5) =6a(6) =2a(7) =11a(8) =5a(9) =21a(10) =10a(11) =1a(12) =39a(13) =22a(14) =3a(15) =73a(16) =46a(17) =9a(18) =136a(19) =97a(20) =22a(21) =1a(22) =254a(23) =200a(24) =54a(25) =4a(26) =474a(27) =410a(28) =126a(29) =14

External references