Number of alkyls C_{n+15} H_{2n+10} (Anthr.) with n carbon atoms.

Terms

a(0) =1a(1) =3a(2) =18a(3) =61a(4) =225a(5) =716a(6) =2272a(7) =6826a(8) =20238a(9) =58552a(10) =167625a(11) =473929a(12) =1330490a(13) =3709591a(14) =10296336a(15) =28466065a(16) =78481065a(17) =215878221a(18) =592832960a(19) =1625887129a(20) =4454936029a(21) =12198071235a(22) =33383810793a(23) =91336813784a(24) =249851178964a(25) =683421422654