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A227373 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 18
5 59
6 199
7 693
8 2465
9 8937
10 32880
11 122513
12 461331
13 1753037
14 6713758
15 25888515
16 100427611
17 391657635
18 1534674930
19 6039078032
20 23855475724
21 94561195899
22 376019415794
23 1499554893338
24 5996061250461
25 24034238674758
26 96554979145357
27 388711331661818
28 1567919554600690

[1,1,2,6,18,59,199,693,2465,8937,32880,122513,
 461331,1753037,6713758,25888515,100427611,
 391657635,1534674930,6039078032,23855475724,
 94561195899,376019415794,1499554893338,
 5996061250461,24034238674758,96554979145357,
 388711331661818,1567919554600690]

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Last modified June 1 19:32 EDT 2020. Contains 334762 sequences. (Running on oeis4.)