# A027091 (b-file synthesized from sequence entry) 2 1 3 1 4 5 5 17 6 54 7 169 8 517 9 1559 10 4653 11 13787 12 40638 13 119333 14 349469 15 1021433 16 2981330 17 8693467 18 25333627 19 73795263 20 214915073 21 625855927 22 1822630172 23 5308552227 24 15464475465 25 45060652609 26 131334677147 27 382907083385