# A337291 (b-file synthesized from sequence entry)
1 4
2 12
3 60
4 364
5 2448
6 17556
7 131560
8 1017900
9 8069424
10 65204656
11 535070172
12 4446927732
13 37353738800
14 316621743480
15 2704784196240
16 23263187479980
17 201275443944432
18 1750651680235920
19 15298438066553776
20 134252511729576240
21 1182622941581590080