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A115967 as a simple table

n a(n)
0 1
1 2
2 8
3 28
4 104
5 384
6 1428
7 5316
8 19820
9 73948
10 276044
11 1030796
12 3850048
13 14382248
14 53732172
15 200759004
16 750134520
17 2802980640
18 10474015164
19 39139487292
20 146259311592
21 546558514368
22 2042458815324
23 7632600834924
24 28522903136796

[1,2,8,28,104,384,1428,5316,19820,73948,276044,
 1030796,3850048,14382248,53732172,200759004,
 750134520,2802980640,10474015164,39139487292,
 146259311592,546558514368,2042458815324,
 7632600834924,28522903136796]

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Last modified December 13 03:41 EST 2019. Contains 329968 sequences. (Running on oeis4.)