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

A181327

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

Terms

    a(0) =1a(1) =2a(2) =4a(3) =3a(4) =12a(5) =12a(6) =32a(7) =41a(8) =9a(9) =86a(10) =140a(11) =54a(12) =232a(13) =451a(14) =246a(15) =27a(16) =624a(17) =1416a(18) =1008a(19) =216a(20) =1680a(21) =4357a(22) =3811a(23) =1215a(24) =81a(25) =4522a(26) =13192a(27) =13692a(28) =5832a(29) =810

External references