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A055544 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 45
6 120
7 336
8 920
9 2574
10 7190
11 20262
12 57192
13 162318
14 461622
15 1317165
16 3766096
17 10792399
18 30980862
19 89084844
20 256524560
21 739658472
22 2135213982
23 6170505665
24 17849399616
25 51679366125
26 149750549260
27 434260826883
28 1260197855532
29 3659410074932

[1,2,6,16,45,120,336,920,2574,7190,20262,57192,
 162318,461622,1317165,3766096,10792399,30980862,
 89084844,256524560,739658472,2135213982,
 6170505665,17849399616,51679366125,149750549260,
 434260826883,1260197855532,3659410074932]

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Last modified March 4 08:38 EST 2021. Contains 341781 sequences. (Running on oeis4.)