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A015253 as a simple table

na(n)
21
313
4221
53485
655965
7894621
814317213
9229062301
103665049245
1158640578205
12938250090141
1315011998086813
14240191982810781
153843071671285405
1661489146955314845
17983826350426044061
1815741221610252678813

[1,13,221,3485,55965,894621,14317213,229062301,
 3665049245,58640578205,938250090141,
 15011998086813,240191982810781,3843071671285405,
 61489146955314845,983826350426044061,
 15741221610252678813]