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A156445 as a simple table

na(n)
21
34
418
5138
63910
7446508
889959563
925250999564
1010095521906313
115572579847718200
124311704697906480578

[1,4,18,138,3910,446508,89959563,25250999564,
 10095521906313,5572579847718200,
 4311704697906480578]