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A055358 as a simple table

na(n)
56
696
7874
86040
935458
10187288
11920350
124297240
1319332662
1484615152
15362772194
161531122296
176385177274
1826382771464
19108232980822
20441554515704
211793612585550
227261158583200
2329318205685050

[6,96,874,6040,35458,187288,920350,4297240,
 19332662,84615152,362772194,1531122296,6385177274,
 26382771464,108232980822,441554515704,
 1793612585550,7261158583200,29318205685050]