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A243255 as a simple table

na(n)
00
11
22
36
420
573
6283
71149
84833
920901
1092406
11415878
121899153
138778193
1440988834
15193056506
16916091727
174375298013
1821015823762
19101454449878
20491976470648
212395332765741
2211704830457167

[0,1,2,6,20,73,283,1149,4833,20901,92406,415878,
 1899153,8778193,40988834,193056506,916091727,
 4375298013,21015823762,101454449878,491976470648,
 2395332765741,11704830457167]