Sum of the k-th arithmetic derivative of n-k for k=0..n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =9a(6) =11a(7) =16a(8) =14a(9) =25a(10) =36a(11) =59a(12) =99a(13) =209a(14) =419a(15) =860a(16) =1730a(17) =3862a(18) =9464a(19) =21868a(20) =74371a(21) =244648a(22) =727345a(23) =3098351a(24) =13469007a(25) =56269849a(26) =281642632a(27) =1406177909a(28) =9597415332a(29) =58891421656