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A081670 as a simple table

na(n)
01
14
214
346
4150
5494
61652
75618
819430
968302
10243804
11882578
123235596
1311994922
1444899568
15169466426
16644127110
172462746382
189462555788
1936507525266
20141333313220
21548718227642
222135480023328
238327573906426
2432530033219580

[1,4,14,46,150,494,1652,5618,19430,68302,243804,
 882578,3235596,11994922,44899568,169466426,
 644127110,2462746382,9462555788,36507525266,
 141333313220,548718227642,2135480023328,
 8327573906426,32530033219580]