# A049937 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 5 5 10 6 24 7 45 8 89 9 178 10 444 11 844 12 1667 13 3320 14 6635 15 13267 16 26533 17 53066 18 132664 19 252062 20 497492 21 991669 22 1981685 23 3962547 24 7924694 25 15849122 26 31698155 27 63396266 28 126792511 29 253585008 30 507170011 31 1014340019 32 2028680037 33 4057360074 34 10143400184 35 19272460350 36 38037750692