# A260949 (b-file synthesized from sequence entry)
0 1
1 4
2 16
3 76
4 416
5 2576
6 17840
7 137268
8 1170104
9 11050940
10 115885968
11 1353366864
12 17640817784
13 256630492660
14 4153220868128
15 74315436120300
16 1458541231513152
17 31131651836906752
18 716862465409883040
19 17683184383300077828
20 464519709712796199816