# A067447 (b-file synthesized from sequence entry) 1 6 2 64 3 64 4 625 5 6436343 6 64 7 62748517 8 6561 9 68719476736 10 60466176 11 64268410079232 12 68719476736 13 67108864 14 6103515625 15 6746640616477458432 16 65536 17 66249952919459433152512 18 68719476736 19 609359740010496