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A001874 as a simple table

n a(n)
0 1
1 6
2 27
3 98
4 315
5 924
6 2534
7 6588
8 16407
9 39430
10 91959
11 209034
12 464723
13 1013292
14 2171850
15 4584620
16 9546570
17 19635840
18 39940460
19 80421600
20 160437690
21 317354740
22 622844730
23 1213580820
24 2348773525
25 4517541378
26 8638447293
27 16428864606
28 31086197469
29 58539877020

[1,6,27,98,315,924,2534,6588,16407,39430,91959,
 209034,464723,1013292,2171850,4584620,9546570,
 19635840,39940460,80421600,160437690,317354740,
 622844730,1213580820,2348773525,4517541378,
 8638447293,16428864606,31086197469,58539877020]

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Last modified June 14 12:04 EDT 2021. Contains 345025 sequences. (Running on oeis4.)