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A361140 as a simple table

na(n)
10
20
34
463
5720
67254
768460
8621315
95496208
1047759130
11409620156
123478672642
1329315742924
14245539064736
152046309441924
1616983591315267

[0,0,4,63,720,7254,68460,621315,5496208,47759130,
 409620156,3478672642,29315742924,245539064736,
 2046309441924,16983591315267]