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A227746 as a simple table

na(n)
12
213
3210
410092
51378923
6536234494
7593219255593
81866485946679255
916707964949615383863
10425495289603079437453771
1130826893520750966059187346452

[2,13,210,10092,1378923,536234494,593219255593,
 1866485946679255,16707964949615383863,
 425495289603079437453771,
 30826893520750966059187346452]