# A141808 (b-file synthesized from sequence entry) 1 6 2 12 3 20 4 56 5 60 6 72 7 272 8 504 9 992 10 16256 11 65792 12 67100672 13 4295032832 14 17179738112 15 274877382656 16 4611686016279904256 17 5316911983139663489309385231907684352 18 383123885216472214589586756168607276261994643096338432