# A037231 (b-file synthesized from sequence entry) 1 2 2 3 3 7 4 23 5 43 6 139 7 283 8 659 9 1319 10 5179 11 9227 12 23159 13 55399 14 148439 15 366683 16 793439 17 1953839 18 4875119 19 9750239 20 27353747 21 71815607 22 192287243 23 430893643