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A293455 as a simple table

na(n)
11
26
3-84
44704
5-345744
634689648
7-4214388864
8601692751296
9-98355859080192
1018095231814398592
11-3699821591569942272
12832503662673228725760
13-204513977951411795896320
1454487882834444658521294848
15-15654578707586867016637562880
164826050889976725020111217528832

[1,6,-84,4704,-345744,34689648,-4214388864,
 601692751296,-98355859080192,18095231814398592,
 -3699821591569942272,832503662673228725760,
 -204513977951411795896320,
 54487882834444658521294848,
 -15654578707586867016637562880,
 4826050889976725020111217528832]