# A133993 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 4 4 9 5 14 6 31 7 56 8 117 9 226 10 459 11 908 12 1825 13 3638 14 7287 15 14560 16 29133 17 58250 18 116515 19 233012 20 466041 21 932062 22 1864143 23 3728264 24 7456549 25 14913074 26 29826171 27 59652316 28 119304657 29 238609286 30 477218599 31 954437168 32 1908874365 33 3817748698 34 7635497427