# A231643 (b-file synthesized from sequence entry) 0 10 1 15 2 25 3 45 4 85 5 165 6 325 7 645 8 1285 9 2565 10 5125 11 10245 12 20485 13 40965 14 81925 15 163845 16 327685 17 655365 18 1310725 19 2621445 20 5242885 21 10485765 22 20971525 23 41943045 24 83886085 25 167772165 26 335544325 27 671088645 28 1342177285 29 2684354565 30 5368709125 31 10737418245