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A128356 as a simple table

n a(n)
1 20
2 21
3 1555
4 889
5 253
6 2041
7 5846759
8 148305659
9 1081
10 279241
11 9641
12 950123
13 33661
14 63213709997
15 583223
16 3775349
17 72707647
18 149070763
19 196932497
20 5091481
21 25760459
22 14307947980741
23 13861
24 9362711
25 376457
26 132766545553
27 63757

[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]

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Last modified February 23 09:32 EST 2018. Contains 299509 sequences. (Running on oeis4.)