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A120989 as a simple table

n a(n)
1 2
2 9
3 34
4 123
5 440
6 1573
7 5642
8 20332
9 73644
10 268090
11 980628
12 3603065
13 13293540
14 49234605
15 182991450
16 682341000
17 2551955340
18 9570762990
19 35985909180
20 135628219350
21 512302356384
22 1939078493154
23 7353556121924
24 27936898370248
25 106313496846200

[2,9,34,123,440,1573,5642,20332,73644,268090,
 980628,3603065,13293540,49234605,182991450,
 682341000,2551955340,9570762990,35985909180,
 135628219350,512302356384,1939078493154,
 7353556121924,27936898370248,106313496846200]

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Last modified November 22 13:47 EST 2019. Contains 329393 sequences. (Running on oeis4.)