# A001278 (b-file synthesized from sequence entry)
4 1
5 11
6 87
7 693
8 5934
9 55674
10 572650
11 6429470
12 78366855
13 1031378445
14 14583751161
15 220562730171
16 3553474061452
17 60765835154948
18 1099353888345924
19 20980355229808524
20 421242574828254525
21 8876636475162819615
22 195887449298481357835
23 4517865858233007694865
24 108699311713253202373146
25 2723633081926998772488606