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A183916 as a simple table

n a(n)
1 1
2 9
3 41
4 177
5 649
6 2137
7 6375
8 17575
9 45207
10 109583
11 252117
12 553981
13 1168261
14 2374753
15 4669367
16 8908546
17 16535154
18 29927526
19 52925886
20 91617530
21 155484150
22 259062316
23 424306230
24 683919048
25 1085984406
26 1700352360
27 2627337510

[1,9,41,177,649,2137,6375,17575,45207,109583,
 252117,553981,1168261,2374753,4669367,8908546,
 16535154,29927526,52925886,91617530,155484150,
 259062316,424306230,683919048,1085984406,
 1700352360,2627337510]

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Last modified February 3 08:18 EST 2023. Contains 360034 sequences. (Running on oeis4.)