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A055904 as a simple table

n a(n)
8 1
9 17
10 181
11 1361
12 8107
13 40187
14 172207
15 653921
16 2243296
17 7053912
18 20568960
19 56141388
20 144540144
21 353269224
22 824102928
23 1843357923
24 3969216603
25 8255612079
26 16635486439
27 32560881353
28 62048339353
29 115351334813

[1,17,181,1361,8107,40187,172207,653921,2243296,
 7053912,20568960,56141388,144540144,353269224,
 824102928,1843357923,3969216603,8255612079,
 16635486439,32560881353,62048339353,115351334813]

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Last modified October 21 11:42 EDT 2019. Contains 328296 sequences. (Running on oeis4.)