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A098912 as a simple table

na(n)
21
35
416
554
6180
7607
82098
97397
1026452
1195821
12350554
131292634
144797694
1517904220
1667125898
17252679320
18954505718
193616951513
2013744169104
2152358244166
22199912298266
23764879838343
242932035371786
2511259007784430
2643303859981236
27166800020984581

[1,5,16,54,180,607,2098,7397,26452,95821,350554,
 1292634,4797694,17904220,67125898,252679320,
 954505718,3616951513,13744169104,52358244166,
 199912298266,764879838343,2932035371786,
 11259007784430,43303859981236,166800020984581]