# A004391 (b-file synthesized from sequence entry)
10 1
11 88
12 4560
13 182104
14 6210820
15 190578024
16 5423611200
17 145944307080
18 3762079360182
19 93755645897200
20 2274048887320496
21 53952131116576224
22 1256860484360380900
23 28835791641008439920
24 653085721923526608480