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A122681 as a simple table

na(n)
10
21
34
419
554
6180
7508
81533
94332
1013041
1137492
12111367
13326636
14968802
152858460
168483290
1725113618
1874512947
19220885446
20655274837
211943117294
225763235194
2317089323366
2450673594159
25150232437482
26445359235627
271320070201468

[0,1,4,19,54,180,508,1533,4332,13041,37492,111367,
 326636,968802,2858460,8483290,25113618,74512947,
 220885446,655274837,1943117294,5763235194,
 17089323366,50673594159,150232437482,445359235627,
 1320070201468]