# A068134 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 3 4 7 5 12 6 56 7 109 8 368 9 1332 10 5656 11 28248 12 140547 13 774325 14 8485151 15 34339452 16 397492132 17 3996973827 18 63229707890 19 1039037824132