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A009275 as a simple table

na(n)
01
11
21
3-4
4-19
512
6517
71472
8-18023
9-159792
10587529
1116362304
1219183749
13-1834702400
14-12219870323
15218477736448
163379214470193
17-23399883425536
18-883981857320943
19225490426670080
20238930492488456221

[1,1,1,-4,-19,12,517,1472,-18023,-159792,587529,
 16362304,19183749,-1834702400,-12219870323,
 218477736448,3379214470193,-23399883425536,
 -883981857320943,225490426670080,
 238930492488456221]