Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns with only nonzero entries (0<=k<=floor(n/2)).

A181307

Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns with only nonzero entries (0<=k<=floor(n/2)).

Terms

    a(0) =1a(1) =2a(2) =6a(3) =1a(4) =18a(5) =6a(6) =54a(7) =27a(8) =1a(9) =162a(10) =108a(11) =10a(12) =486a(13) =405a(14) =64a(15) =1a(16) =1458a(17) =1458a(18) =334a(19) =14a(20) =4374a(21) =5103a(22) =1549a(23) =117a(24) =1a(25) =13122a(26) =17496a(27) =6652a(28) =760a(29) =18

External references