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A173871 as a simple table

n a(n)
0 0
1 1
2 5
3 16
4 53
5 145
6 441
7 1165
8 3325
9 8840
10 24268
11 63542
12 172420
13 446485
14 1182329
15 3055461
16 7966038
17 20351233
18 52507157
19 133014971
20 339170500
21 853849745
22 2154442760
23 5382418592
24 13481157491
25 33449252747
26 83091028844
27 205013093570
28 505799029994
29 1240477207822
30 3042433058325

[0,1,5,16,53,145,441,1165,3325,8840,24268,63542,
 172420,446485,1182329,3055461,7966038,20351233,
 52507157,133014971,339170500,853849745,2154442760,
 5382418592,13481157491,33449252747,83091028844,
 205013093570,505799029994,1240477207822,
 3042433058325]

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Last modified April 11 02:27 EDT 2021. Contains 342886 sequences. (Running on oeis4.)