Irreducible Euler sums of weight 8 and depth 10+2n.

Terms

a(0) =1a(1) =4a(2) =15a(3) =40a(4) =99a(5) =212a(6) =429a(7) =800a(8) =1430a(9) =2424a(10) =3978a(11) =6288a(12) =9690a(13) =14520a(14) =21318a(15) =30624a(16) =43263a(17) =60060a(18) =82225a(19) =110968a(20) =148005a(21) =195052a(22) =254475a(23) =328640a(24) =420732a(25) =533936a(26) =672452a(27) =840480a(28) =1043460a(29) =1286832