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A294687 as a simple table

na(n)
10
20
30
40
5300
692680
70
815750
913794150
108221452750
1124
12510312
131686135376
144495236798162
1511696087875731720
16300
1713794450
18193054017440
192425003938178050
2030852000867277668428
21403564024914127655401650
222400
23343501500
2421664357535320
251317601563731383350
2682985159653854019928352
275411356249329837891442095560

[0,0,0,0,300,92680,0,15750,13794150,8221452750,24,
 510312,1686135376,4495236798162,11696087875731720,
 300,13794450,193054017440,2425003938178050,
 30852000867277668428,403564024914127655401650,
 2400,343501500,21664357535320,1317601563731383350,
 82985159653854019928352,
 5411356249329837891442095560]