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A273718 as a simple table

n a(n)
2 0
3 0
4 1
5 5
6 20
7 74
8 263
9 914
10 3134
11 10655
12 36023
13 121331
14 407610
15 1366926
16 4578365
17 15321750
18 51245820
19 171335458
20 572714527
21 1914159445
22 6397373996
23 21381342737
24 71465609723
25 238892470728
26 798659461590
27 2670437231049
28 8930385538663
29 29869572490093
30 99922049387230
31 334324916304050

[0,0,1,5,20,74,263,914,3134,10655,36023,121331,
 407610,1366926,4578365,15321750,51245820,
 171335458,572714527,1914159445,6397373996,
 21381342737,71465609723,238892470728,798659461590,
 2670437231049,8930385538663,29869572490093,
 99922049387230,334324916304050]

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Last modified May 9 09:51 EDT 2021. Contains 343700 sequences. (Running on oeis4.)