# A226931 (b-file synthesized from sequence entry) 1 3 2 9 3 53 4 231 5 5319 6 3167 7 1296273 8 1604979 9 64370707 10 22906587 11 411169704813 12 610433321 13 424312831956207 14 2146177886409 15 98731231639051 16 12218411169233691 17 1112291237880234922707 18 2196818399875253 19 2619031544578888560315813 20 16827894135040576041