a(n) = (n!)^8 * Sum_{i=1..n} 1/i^8.A291506a(n) = (n!)^8 * Sum_{i=1..n} 1/i^8.Terms a(0) =0a(1) =1a(2) =257a(3) =1686433a(4) =110523752704External referencesoeis: A291506