Triangle read by rows: T(n,k) is the number of 2-compositions of n having least entry equal to k (n >= 1; 0 <= k <= floor(n/2)).

A181365

Triangle read by rows: T(n,k) is the number of 2-compositions of n having least entry equal to k (n >= 1; 0 <= k <= floor(n/2)).

Terms

    a(0) =2a(1) =6a(2) =1a(3) =22a(4) =2a(5) =78a(6) =3a(7) =1a(8) =272a(9) =6a(10) =2a(11) =940a(12) =13a(13) =2a(14) =1a(15) =3232a(16) =28a(17) =2a(18) =2a(19) =11080a(20) =58a(21) =3a(22) =2a(23) =1a(24) =37920a(25) =118a(26) =6a(27) =2a(28) =2a(29) =129648

External references