a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n-k+1), where k = floor(n/2), s = A005408 (odd natural numbers), t = A023533.

A025115

a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n-k+1), where k = floor(n/2), s = A005408 (odd natural numbers), t = A023533.

Terms

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

External references