a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = A023531.
A024855
a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = A023531.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =3a(6) =4a(7) =1a(8) =2a(9) =3a(10) =4a(11) =5a(12) =7a(13) =9a(14) =11a(15) =4a(16) =5a(17) =6a(18) =8a(19) =10a(20) =12a(21) =14a(22) =16a(23) =18a(24) =20a(25) =9a(26) =11a(27) =13a(28) =15a(29) =17
External references
- oeis: A024855