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A009502 as a simple table

na(n)
01
13
233
3403
4-41247
5-12404989
6-3175861439
7-925805229229
8-320290449542079
9-131747901365358205
10-63921607627858687775
11-36198590593345414392685
12-23669080385211533481142239
13-17684215690454157561823950973

[1,3,33,403,-41247,-12404989,-3175861439,
 -925805229229,-320290449542079,
 -131747901365358205,-63921607627858687775,
 -36198590593345414392685,
 -23669080385211533481142239,
 -17684215690454157561823950973]