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A265945 as a simple table

na(n)
01
12
26
318
464
5220
6888
73192
815104
948096
10338400
11285120
1213728768
13-75484032
141327431168
15-15621137280
16232048220160
17-3468200017920
1856208508250112
19-959557688285184
2017344153658234880
21-330228975428997120
226611419866845122560
23-138844103855232061440

[1,2,6,18,64,220,888,3192,15104,48096,338400,
 285120,13728768,-75484032,1327431168,-15621137280,
 232048220160,-3468200017920,56208508250112,
 -959557688285184,17344153658234880,
 -330228975428997120,6611419866845122560,
 -138844103855232061440]