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A027121 as a simple table

na(n)
21
34
413
540
6120
7352
81022
92948
108473
1124304
1269649
13199544
14571795
151639244
164702499
1713500396
1838790727
19111555296
20321100627
21925086012
222667533646
237698716068
2422238169212
2564289860528
26186010834243
27538611262492

[1,4,13,40,120,352,1022,2948,8473,24304,69649,
 199544,571795,1639244,4702499,13500396,38790727,
 111555296,321100627,925086012,2667533646,
 7698716068,22238169212,64289860528,186010834243,
 538611262492]