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A027312 as a simple table

n a(n)
0 1
1 6
2 27
3 101
4 357
5 1215
6 4043
7 13239
8 42849
9 137446
10 437775
11 1386369
12 4369661
13 13717842
14 42918903
15 133887207
16 416601657
17 1293386940
18 4007492727
19 12395015289
20 38276340453
21 118029405441
22 363483388935
23 1118056644207
24 3435356994857
25 10545018480000
26 32338826982603

[1,6,27,101,357,1215,4043,13239,42849,137446,
 437775,1386369,4369661,13717842,42918903,
 133887207,416601657,1293386940,4007492727,
 12395015289,38276340453,118029405441,363483388935,
 1118056644207,3435356994857,10545018480000,
 32338826982603]

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Last modified February 7 11:02 EST 2023. Contains 360115 sequences. (Running on oeis4.)