# A139806 (b-file synthesized from sequence entry) 0 1 1 3 2 7 3 15 4 27 5 55 6 111 7 223 8 443 9 887 10 1775 11 3551 12 7099 13 14199 14 28399 15 56799 16 113595 17 227191 18 454383 19 908767 20 1817531 21 3635063 22 7270127 23 14540255 24 29080507 25 58161015 26 116322031 27 232644063 28 465288123 29 930576247 30 1861152495 31 3722304991 32 7444609979 33 14889219959