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A249997 as a simple table

n a(n)
0 1
1 2
2 15
3 40
4 221
5 702
6 3355
7 11780
8 52041
9 193402
10 817895
11 3138720
12 12953461
13 50618102
14 206059635
15 813476860
16 3286192481
17 13047914802
18 52482224575
19 209057202200
20 838843897101
21 3347530323502
22 13413657088715
23 53584020970740
24 214547906035321
25 857556157684202

[1,2,15,40,221,702,3355,11780,52041,193402,817895,
 3138720,12953461,50618102,206059635,813476860,
 3286192481,13047914802,52482224575,209057202200,
 838843897101,3347530323502,13413657088715,
 53584020970740,214547906035321,857556157684202]

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Last modified November 14 23:06 EST 2018. Contains 317221 sequences. (Running on oeis4.)