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A180666 as a simple table

na(n)
00
11
22
36
415
541
6106
7279
8729
91911
105001
1113095
1234281
1389752
14234971
15615165
161610520
174216400
1811038675
1928899630
2075660210
21198081006
22518582802
231357667406
243554419410
259305590831
2624362353076
2763781468404

[0,1,2,6,15,41,106,279,729,1911,5001,13095,34281,
 89752,234971,615165,1610520,4216400,11038675,
 28899630,75660210,198081006,518582802,1357667406,
 3554419410,9305590831,24362353076,63781468404]