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A091140 as a simple table

n a(n)
1 1
2 3
3 9
4 28
5 86
6 266
7 820
8 2532
9 7812
10 24112
11 74408
12 229640
13 708688
14 2187120
15 6749712
16 20830528
17 64285664
18 198394016
19 612269632
20 1889544000
21 5831378496
22 17996393728
23 55539213440
24 171401244800
25 528966555904
26 1632459664128
27 5037983062272
28 15547871669248

[1,3,9,28,86,266,820,2532,7812,24112,74408,229640,
 708688,2187120,6749712,20830528,64285664,
 198394016,612269632,1889544000,5831378496,
 17996393728,55539213440,171401244800,528966555904,
 1632459664128,5037983062272,15547871669248]

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)