# A344273 (b-file synthesized from sequence entry)
1 1
2 6
3 24
4 80
5 273
6 960
7 3336
8 11480
9 39648
10 136952
11 472416
12 1630164
13 5625480
14 19412736
15 66992016
16 231184800
17 797806152
18 2753187210
19 9501109380
20 32787848746