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A339787 as a simple table

na(n)
10
20
30
44
568
6812
78512
884312
9814184
107781712
1174182124
12708344640
136790655496
1465440865012
15634347822304
166186652422650
1760707391493004
18599283097168488
195950282272766412
2059408426130151164
21596269843123151304
226014472189177940224
2360952019560703982452

[0,0,0,4,68,812,8512,84312,814184,7781712,
 74182124,708344640,6790655496,65440865012,
 634347822304,6186652422650,60707391493004,
 599283097168488,5950282272766412,
 59408426130151164,596269843123151304,
 6014472189177940224,60952019560703982452]