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A084128 as a simple table

na(n)
01
12
212
356
4272
51312
66336
730592
8147712
9713216
103443712
1116627712
1280285696
13387653632
141871757312
159037643776
1643637604352
17210700992512
181017354387456
194912221519872
2023718303629312
21114522100596736
22552961616904192
232669934870003712

[1,2,12,56,272,1312,6336,30592,147712,713216,
 3443712,16627712,80285696,387653632,1871757312,
 9037643776,43637604352,210700992512,1017354387456,
 4912221519872,23718303629312,114522100596736,
 552961616904192,2669934870003712]