# A090401 (b-file synthesized from sequence entry) 0 1 1 3 2 9 3 27 4 78 5 225 6 648 7 1863 8 5355 9 15390 10 44226 11 127089 12 365202 13 1049436 14 3015630 15 8665623 16 24901263 17 71555481 18 205619553 19 590861790 20 1697881581 21 4878978300 22 14020076241 23 40287643353 24 115769285316 25 332670921048