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A323721 as a simple table

na(n)
00
11
22
3-3
4-6
550
6-13
7-1498
86234
959145
10-748678
11-1415238
1292962179
13-411570250
14-11993577118
15167710062977
161224967301754
17-51920085859710
18135335259830867
1914992073315394822
20-201575378391009366
21-3667884891055854535
22128570113943360964602
23209758874692705861322

[0,1,2,-3,-6,50,-13,-1498,6234,59145,-748678,
 -1415238,92962179,-411570250,-11993577118,
 167710062977,1224967301754,-51920085859710,
 135335259830867,14992073315394822,
 -201575378391009366,-3667884891055854535,
 128570113943360964602,209758874692705861322]