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A071726 as a simple table

na(n)
01
11
22
36
416
547
6146
7471
81562
95291
1018226
1163648
12224808
13801686
142882452
1510437745
1638032110
17139339635
18512996370
191896907980
207041759120
2126233530210
2298046684060
23367525880670
241381386710964
255205006015102

[1,1,2,6,16,47,146,471,1562,5291,18226,63648,
 224808,801686,2882452,10437745,38032110,139339635,
 512996370,1896907980,7041759120,26233530210,
 98046684060,367525880670,1381386710964,
 5205006015102]