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A012284 as a simple table

na(n)
00
10
22
3-3
44
5-20
6230
7-1911
812920
9-104040
101058458
11-11889955
12141336380
13-1804017852
1424962731950
15-371663464095
165900573560752
17-99478198783184
181776396441716658
19-33501559023746883
20665305926036550324

[0,0,2,-3,4,-20,230,-1911,12920,-104040,1058458,
 -11889955,141336380,-1804017852,24962731950,
 -371663464095,5900573560752,-99478198783184,
 1776396441716658,-33501559023746883,
 665305926036550324]