# A195568 (b-file synthesized from sequence entry)
1 3
2 8
3 120
4 637
5 2176
6 30848
7 164483
8 561288
9 7958776
10 42435837
11 144810240
12 2053333248
13 10948281603
14 37360480520
15 529752019320
16 2824614217597
17 9638859164032
18 136673967651200
19 728739519858563
20 2486788303839624
21 35261353901990392