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A128356 as a simple table

na(n)
120
221
31555
4889
5253
62041
75846759
8148305659
91081
10279241
119641
12950123
1333661
1463213709997
15583223
163775349
1772707647
18149070763
19196932497
205091481
2125760459
2214307947980741
2313861
249362711
25376457
26132766545553
2763757

[20,21,1555,889,253,2041,5846759,148305659,1081,
 279241,9641,950123,33661,63213709997,583223,
 3775349,72707647,149070763,196932497,5091481,
 25760459,14307947980741,13861,9362711,376457,
 132766545553,63757]