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A251427 as a simple table

na(n)
180
21128
39120
494452
5863840
67658288
764105154
8526064608
94251906158
1034199112972
11274205462432
122196305116240
1317580163235182
14140685755592632

[80,1128,9120,94452,863840,7658288,64105154,
 526064608,4251906158,34199112972,274205462432,
 2196305116240,17580163235182,140685755592632]