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A298256 as a simple table

n a(n)
1 0
2 11
3 3
4 23
5 86
6 238
7 604
8 2492
9 7722
10 26880
11 93816
12 323639
13 1117834
14 3898368
15 13506089
16 46957460
17 163354721
18 567902351
19 1974550100
20 6868633724
21 23885771820
22 83075178134
23 288949706185
24 1004983567658
25 3495450659632
26 12157805469082

[0,11,3,23,86,238,604,2492,7722,26880,93816,
 323639,1117834,3898368,13506089,46957460,
 163354721,567902351,1974550100,6868633724,
 23885771820,83075178134,288949706185,
 1004983567658,3495450659632,12157805469082]

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Last modified January 19 09:16 EST 2022. Contains 350464 sequences. (Running on oeis4.)