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A007721 as a simple table

n a(n)
1 1
2 1
3 2
4 6
5 19
6 68
7 236
8 863
9 3137
10 11636
11 43306
12 162728
13 614142
14 2330454
15 8875656
16 33924699
17 130038017
18 499753560
19 1924912505
20 7429159770
21 28723877046
22 111236422377
23 431403469046
24 1675316533812
25 6513837677642
26 25354842098354
27 98794053266471
28 385312558567775

[1,1,2,6,19,68,236,863,3137,11636,43306,162728,
 614142,2330454,8875656,33924699,130038017,
 499753560,1924912505,7429159770,28723877046,
 111236422377,431403469046,1675316533812,
 6513837677642,25354842098354,98794053266471,
 385312558567775]

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Last modified February 21 20:39 EST 2020. Contains 332111 sequences. (Running on oeis4.)