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A257520 as a simple table

na(n)
01
11
22
34
410
526
671
7197
8554
91570
104477
1112827
1236895
13106471
14308114
15893804
162598314
177567466
1822076405
1964498427
20188689685
21552675365
221620567764
234756614062
2413974168191
2541088418151
26120906613076
27356035078102
281049120176954
293093337815410

[1,1,2,4,10,26,71,197,554,1570,4477,12827,36895,
 106471,308114,893804,2598314,7567466,22076405,
 64498427,188689685,552675365,1620567764,
 4756614062,13974168191,41088418151,120906613076,
 356035078102,1049120176954,3093337815410]