Euler transform of A025225.

Terms

a(0) =1a(1) =2a(2) =7a(3) =28a(4) =139a(5) =762a(6) =4549a(7) =28464a(8) =184742a(9) =1230348a(10) =8362298a(11) =57756888a(12) =404218046a(13) =2860222020a(14) =20428192842a(15) =147072637472