# A018086 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 8 4 14 5 28 6 53 7 102 8 196 9 380 10 734 11 1419 12 2744 13 5308 14 10268 15 19861 16 38416 17 74310 18 143740 19 278041 20 537824 21 1040333 22 2012354 23 3892568 24 7529536 25 14564656 26 28172944 27 54495952 28 105413504 29 203905180