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A006673 as a simple table

na(n)
00
11
22
32
4-8
5-56
6-112
7848
89088
925216
10-310528
11-4334848
12-14701568
13270029824
144554426368
1517536821248
16-458243735552
17-8926669144064
18-37024075153408
191341521605885952
2029290212127670272
21125297096967061504
22-6224109737622372352

[0,1,2,2,-8,-56,-112,848,9088,25216,-310528,
 -4334848,-14701568,270029824,4554426368,
 17536821248,-458243735552,-8926669144064,
 -37024075153408,1341521605885952,
 29290212127670272,125297096967061504,
 -6224109737622372352]