Inverse binomial transform of A026641; binomial transform of A127361.

Terms

a(0) =1a(1) =0a(2) =3a(3) =3a(4) =15a(5) =30a(6) =99a(7) =252a(8) =747a(9) =2064a(10) =5973a(11) =16995a(12) =49089a(13) =141414a(14) =409755a(15) =1188243a(16) =3455811a(17) =10064952a(18) =29368377a(19) =85809681a(20) =251067645a(21) =735446106a(22) =2156695533a(23) =6330729438a(24) =18600079221a(25) =54693760680a(26) =160951905819a(27) =473984678037