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A181765 as a simple table

na(n)
00
12
212
354
4230
5948
63860
715624
863014
9253588
101019072
114091174
1216412668
1365808044
14263755984
151056789662
164233176854
1716953418148
1867885557896
19271793651816
201088059997732
214355377285932
2217432688395816
2369770793302408
24279227252601884

[0,2,12,54,230,948,3860,15624,63014,253588,
 1019072,4091174,16412668,65808044,263755984,
 1056789662,4233176854,16953418148,67885557896,
 271793651816,1088059997732,4355377285932,
 17432688395816,69770793302408,279227252601884]