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A001872 as a simple table

n a(n)
0 1
1 4
2 14
3 40
4 105
5 256
6 594
7 1324
8 2860
9 6020
10 12402
11 25088
12 49963
13 98160
14 190570
15 366108
16 696787
17 1315072
18 2463300
19 4582600
20 8472280
21 15574520
22 28481220
23 51833600
24 93914325
25 169457708
26 304597382
27 545556512
28 973877245
29 1733053440
30 3075011478

[1,4,14,40,105,256,594,1324,2860,6020,12402,25088,
 49963,98160,190570,366108,696787,1315072,2463300,
 4582600,8472280,15574520,28481220,51833600,
 93914325,169457708,304597382,545556512,973877245,
 1733053440,3075011478]

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Last modified May 9 16:51 EDT 2024. Contains 372354 sequences. (Running on oeis4.)