a(n) = 1*t(n) + 2*t(n-1) + ... + k*t(n+1-k), where k = floor((n+1)/2), t = A023531.

Terms

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