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A009518 as a simple table

na(n)
00
12
216
3152
4-5504
5-1107808
6-155757824
7-22741022848
8-3557729644544
9-565165935635968
10-73212906789515264
114150737348343519232
1211583034460298696687616
138797240254608561943191552

[0,2,16,152,-5504,-1107808,-155757824,
 -22741022848,-3557729644544,-565165935635968,
 -73212906789515264,4150737348343519232,
 11583034460298696687616,8797240254608561943191552]