a(n) = (7*n + 1)^7.A016999a(n) = (7*n + 1)^7.Terms a(0) =1a(1) =2097152a(2) =170859375a(3) =2494357888a(4) =17249876309a(5) =78364164096a(6) =271818611107a(7) =781250000000External referencesoeis: A016999