a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 2), t = A023531.

A024870

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 2), t = A023531.

Terms

    a(0) =2a(1) =0a(2) =0a(3) =2a(4) =3a(5) =4a(6) =5a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =9a(13) =11a(14) =13a(15) =5a(16) =6a(17) =7a(18) =10a(19) =12a(20) =14a(21) =16a(22) =18a(23) =20a(24) =22a(25) =11a(26) =13a(27) =15a(28) =17a(29) =19

External references