# A149121 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 9 4 34 5 94 6 368 7 1131 8 4398 9 14236 10 55984 11 188576 12 740000 13 2551442 14 10067316 15 35443271 16 139712062 17 498416468 18 1971107420 19 7122847862 20 28153558524 21 102603939062 22 406431688608 23 1494188962016 24 5916706122284 25 21880889654074 26 86779037261076 27 322951842854822 28 1280521402780940 29 4786287052515392