# A049905 (b-file synthesized from sequence entry) 1 1 2 2 3 2 4 3 5 7 6 12 7 25 8 50 9 101 10 153 11 331 12 675 13 1355 14 2714 15 5429 16 10858 17 21717 18 32577 19 70583 20 143881 21 289121 22 578922 23 1158188 24 2316554 25 4633160 26 9266371 27 18532767 28 37065547 29 74131099 30 148262202 31 296524405 32 593048810 33 1186097621