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A012437 as a simple table

na(n)
02
1-4
2278
3-6984
4906282
5-72406860
616769884350
7-2791769139600
81025112403117650
9-291983305370462100
10156358879820283153510
11-68012449387139352098520
1250073830528033335130526330

[2,-4,278,-6984,906282,-72406860,16769884350,
 -2791769139600,1025112403117650,
 -291983305370462100,156358879820283153510,
 -68012449387139352098520,
 50073830528033335130526330]