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A117253 as a simple table

na(n)
01
11
2-3
345
4-2430
5433026
6-245525742
7434685788658
8-2376644549487615
939849199161258840705
10-2039314646436750180150939
11317469566015078743658568283029
12-149970083228995077874358388356635368
13214577598849654850870918566871719460091160

[1,1,-3,45,-2430,433026,-245525742,434685788658,
 -2376644549487615,39849199161258840705,
 -2039314646436750180150939,
 317469566015078743658568283029,
 -149970083228995077874358388356635368,
 214577598849654850870918566871719460091160]