# A115136 (b-file synthesized from sequence entry)
0 1
1 4
2 21
3 124
4 773
5 4988
6 33029
7 223228
8 1533957
9 10686460
10 75309061
11 535920636
12 3845881861
13 27800469500
14 202244161541
15 1479594737660
16 10878806654981
17 80345708888060
18 595788935725061
19 4434080431079420
20 33109442115403781