Numerator of Sum_{k=1..n-1} 1/(k*(n-k))^2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =41a(5) =13a(6) =8009a(7) =161a(8) =190513a(9) =167101a(10) =13371157a(11) =21857a(12) =316786853a(13) =371449a(14) =52598187029a(15) =260957190289a(16) =129548894873a(17) =3562512061a(19) =814542451061