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A012305 as a simple table

na(n)
00
10
22
3-3
412
5-40
6358
7-2499
825032
9-229104
102865402
11-36173115
12550240020
13-8500522680
14149846317710
15-2762418635235
1656365118364240
17-1205267403147360
1827829436319559410
19-674568212738977395

[0,0,2,-3,12,-40,358,-2499,25032,-229104,2865402,
 -36173115,550240020,-8500522680,149846317710,
 -2762418635235,56365118364240,-1205267403147360,
 27829436319559410,-674568212738977395]