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A251825 as a simple table

na(n)
122266
275498
3397474
41692106
510655426
660427490
7266585018
81720131962
99899825738
1044110390034
11286549040066
121655932624738
137402688238938
1448189908925410
15278843662602562
161247991528395130
178129795907826714

[22266,75498,397474,1692106,10655426,60427490,
 266585018,1720131962,9899825738,44110390034,
 286549040066,1655932624738,7402688238938,
 48189908925410,278843662602562,1247991528395130,
 8129795907826714]