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A261174 as a simple table

n a(n)
0 1
1 2
2 9
3 30
4 90
5 248
6 650
7 1560
8 3560
9 7680
10 15786
11 31076
12 58905
13 107768
14 191180
15 329664
16 554038
17 909558
18 1461655
19 2302950
20 3563482
21 5422392
22 8124040
23 11997648
24 17482295
25 25156872

[1,2,9,30,90,248,650,1560,3560,7680,15786,31076,
 58905,107768,191180,329664,554038,909558,1461655,
 2302950,3563482,5422392,8124040,11997648,17482295,
 25156872]

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)