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A281041 as a simple table

na(n)
01
10
21
312
45
550
61
7252
829
9990
1047
114020
1277
1316134
14115
1565328
16295
17261376
18639
191046556
20969
214193088
223295
2316772328
244251
2567098268
2614737
27268411156
2827977
291073705600
3050111
314294842748
3249617
3317179745636
3449857
3568719368540
36156069

[1,0,1,12,5,50,1,252,29,990,47,4020,77,16134,115,
 65328,295,261376,639,1046556,969,4193088,3295,
 16772328,4251,67098268,14737,268411156,27977,
 1073705600,50111,4294842748,49617,17179745636,
 49857,68719368540,156069]