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A126407 as a simple table

na(n)
01
120
294
3450
42168
510486
650848
7247024
81201730
95852530
1028526860
11139144760
12679090456
133315836420
1416196773236
1579141717426
16386812618952
171891013450430
189246370600422
1945218609940844
20221167392509842

[1,20,94,450,2168,10486,50848,247024,1201730,
 5852530,28526860,139144760,679090456,3315836420,
 16196773236,79141717426,386812618952,
 1891013450430,9246370600422,45218609940844,
 221167392509842]