# A025245 (b-file synthesized from sequence entry) 1 1 2 2 3 5 4 11 5 26 6 65 7 163 8 416 9 1081 10 2837 11 7516 12 20089 13 54077 14 146478 15 398997 16 1092215 17 3003014 18 8289569 19 22964919 20 63828252 21 177931665 22 497367721 23 1393768952 24 3914793457 25 11019379609 26 31079140922 27 87818240869 28 248571086403 29 704722488690