a(n) = A006879(n) - A228065(n).

Terms

a(0) =0a(1) =3a(2) =20a(3) =120a(4) =763a(5) =5210a(6) =38042a(7) =288616a(8) =2259818a(9) =18165437a(10) =149165130a(11) =1246782034a(12) =10576153259a(13) =90845450184a(14) =788766653816