# A145921 (b-file synthesized from sequence entry) 1 1 2 8 3 81 4 2048 5 15625 6 6718464 7 5764801 8 2147483648 9 31381059609 10 64000000000000 11 3138428376721 12 2218611106740436992 13 3937376385699289 14 1115112108958398021632 15 39903080760955810546875 16 604462909807314587353088 17 14063084452067724991009 18 16918235275724100929608539439104