# A276979 (b-file synthesized from sequence entry) 1 1 2 4 3 8 4 81 5 243 6 4096 7 16384 8 390625 9 1953125 10 60466176 11 362797056 12 13841287201 13 96889010407 14 4398046511104 15 35184372088832 16 1853020188851841 17 16677181699666569 18 1000000000000000000 19 10000000000000000000 20 672749994932560009201