Number of compositions of 2n into n powers of 2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =13a(5) =31a(6) =76a(7) =218a(8) =645a(9) =1849a(10) =5281a(11) =15346a(12) =44980a(13) =131704a(14) =385568a(15) =1131874a(16) =3331429a(17) =9819405a(18) =28977079a(19) =85633438a(20) =253424053a(21) =750895163a(22) =2227288196a(23) =6613217348a(24) =19654450476a(25) =58463536356a(26) =174041552556a(27) =518488451716