# A058870 (b-file synthesized from sequence entry)
1 0
2 1
3 4
4 18
5 77
6 346
7 1578
8 7396
9 35297
10 171352
11 843067
12 4196502
13 21092793
14 106912874
15 545851964
16 2804641873
17 14491337393
18 75248330560
19 392476202012
20 2055245665857
21 10801441911431
22 56953955507744
23 301207374937558