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A215790 as a simple table

na(n)
11
21
31
42
510
629
7262
8932
911694
1046988
11727846
123166688
1356797272
14261286670
155219906670
1625024705056

[1,1,1,2,10,29,262,932,11694,46988,727846,3166688,
 56797272,261286670,5219906670,25024705056]