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A037098 as a simple table

na(n)
00
11
23
316
471
5345
61624
717121
871577
9345342
101624171
1117121011
1271577060
13345342131
141624173733
1517331156576
1671473314601
17345325637555
183624144315044
1916333160460471
2071272765314407

[0,1,3,16,71,345,1624,17121,71577,345342,1624171,
 17121011,71577060,345342131,1624173733,
 17331156576,71473314601,345325637555,
 3624144315044,16333160460471,71272765314407]