# A060521 (b-file synthesized from sequence entry)
1 6
2 36
3 102
4 378
5 1260
6 4374
7 14946
8 51384
9 176238
10 605022
11 2076288
12 7126302
13 24457806
14 83942100
15 288096942
16 988778082
17 3393583068
18 11647114446
19 39974047290
20 137194888728
21 470866430838
22 1616060190870
23 5546478488640