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A007718 as a simple table

n a(n)
0 1
1 1
2 3
3 6
4 17
5 40
6 125
7 354
8 1159
9 3774
10 13113
11 46426
12 171027
13 644038
14 2493848
15 9867688
16 39922991
17 164747459
18 693093407
19 2968918400
20 12940917244
21 57353242370
22 258306634422
23 1181572250326
24 5486982683756
25 25856584485254

[1,1,3,6,17,40,125,354,1159,3774,13113,46426,
 171027,644038,2493848,9867688,39922991,164747459,
 693093407,2968918400,12940917244,57353242370,
 258306634422,1181572250326,5486982683756,
 25856584485254]

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Last modified May 21 01:24 EDT 2024. Contains 372720 sequences. (Running on oeis4.)