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A009544 as a simple table

na(n)
00
11
22
32
4-8
5-44
68
7944
82304
9-27632
10-183776
11975072
1215141248
13-27882048
14-1461427328
15-1986004224
16166452797440
17850359527680
18-21941424508416
19-222801125934592
203231615038191616
2157863671042155520

[0,1,2,2,-8,-44,8,944,2304,-27632,-183776,975072,
 15141248,-27882048,-1461427328,-1986004224,
 166452797440,850359527680,-21941424508416,
 -222801125934592,3231615038191616,
 57863671042155520]