Triangle read by rows: T(n,k) is the number of 2-compositions of n having k even entries in the top row. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.
A181336
Triangle read by rows: T(n,k) is the number of 2-compositions of n having k even entries in the top row. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =1a(6) =5a(7) =11a(8) =7a(9) =1a(10) =11a(11) =31a(12) =29a(13) =10a(14) =1a(15) =25a(16) =83a(17) =102a(18) =56a(19) =13a(20) =1a(21) =56a(22) =217a(23) =329a(24) =245a(25) =92a(26) =16a(27) =1a(28) =126a(29) =556
External references
- oeis: A181336