Floor((n*(n+1)^3/8)^n)-(n!)^4.A127425Floor((n*(n+1)^3/8)^n)-(n!)^4.Terms a(0) =0a(1) =0a(2) =29a(3) =12528a(4) =14927013a(5) =44632974375External referencesoeis: A127425