# A298173 (b-file synthesized from sequence entry) 0 1 1 4 2 16 3 50 4 155 5 468 6 1410 7 4234 8 12709 9 38132 10 114404 11 343218 12 1029663 13 3088997 14 9267001 15 27801012 16 83403047 17 250209151 18 750627465 19 2251882406 20 6755647231 21 20266941705 22 60800825129 23 182402475400 24 547207426215 25 1641622278659 26 4924866835993 27 14774600507994