The sequence denoted by d_n used in the calculation of A323260.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =12a(5) =49a(6) =197a(7) =802a(8) =3251a(9) =13199a(10) =53558a(11) =217359a(12) =882077a(13) =3579664a(14) =14526997a(15) =58953567a(16) =239245700a(17) =970908389a(18) =3940146321a(19) =15989925914a(20) =64890414991a(21) =263338678635