a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = A001950 (upper Wythoff sequence).

A024689

a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = A001950 (upper Wythoff sequence).

Terms

    a(0) =4a(1) =10a(2) =39a(3) =55a(4) =125a(5) =165a(6) =302a(7) =365a(8) =591a(9) =682a(10) =1006a(11) =1144a(12) =1602a(13) =1782a(14) =2374a(15) =2620a(16) =3386a(17) =3685a(18) =4650a(19) =5005a(20) =6162a(21) =6607a(22) =8003a(23) =8519a(24) =10176a(25) =10768a(26) =12676a(27) =13382a(28) =15596a(29) =16388

External references