Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^(-6).

Terms

a(0) =1a(1) =322a(2) =1186a(3) =2110a(4) =3034a(5) =3958a(6) =4882a(7) =5806a(8) =6730a(9) =7654a(10) =8578a(11) =9502a(12) =10426a(13) =11350a(14) =12274a(15) =13198a(16) =14122a(17) =15046a(18) =15970a(19) =16894a(20) =17818a(21) =18742a(22) =19666a(23) =20590a(24) =21514a(25) =22438a(26) =23362a(27) =24286a(28) =25210a(29) =26134