Number of pairs (C,D) where C is a composition of u, D is a composition into distinct parts of v, and u + v = n.

A238439

Number of pairs (C,D) where C is a composition of u, D is a composition into distinct parts of v, and u + v = n.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =20a(5) =42a(6) =90a(7) =182a(8) =370a(9) =748a(10) =1526a(11) =3060a(12) =6156a(13) =12344a(14) =24748a(15) =49654a(16) =99392a(17) =198966a(18) =398166a(19) =796658a(20) =1593694a(21) =3188584a(22) =6377714a(23) =12756888a(24) =25515312a(25) =51033092a(26) =102068728a(27) =204141754a(28) =408292220a(29) =816590586

External references