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A251685 as a simple table

n a(n)
0 1
1 2
2 6
3 18
4 45
5 108
6 252
7 578
8 1270
9 2716
10 5678
11 11678
12 23664
13 47182
14 92538
15 178892
16 341481
17 644648
18 1205062
19 2231304
20 4092646
21 7437680
22 13398520
23 23939558
24 42451586
25 74754652
26 130777182
27 227346498
28 392806891
29 674630766
30 1151926416
31 1955909898
32 3303296389
33 5550556238
34 9281646642

[1,2,6,18,45,108,252,578,1270,2716,5678,11678,
 23664,47182,92538,178892,341481,644648,1205062,
 2231304,4092646,7437680,13398520,23939558,
 42451586,74754652,130777182,227346498,392806891,
 674630766,1151926416,1955909898,3303296389,
 5550556238,9281646642]

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Last modified September 21 20:10 EDT 2021. Contains 347598 sequences. (Running on oeis4.)