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A291030 as a simple table

n a(n)
0 1
1 4
2 15
3 56
4 208
5 767
6 2812
7 10278
8 37530
9 137044
10 500571
11 1828818
12 6682264
13 24416877
14 89218462
15 325997507
16 1191160160
17 4352355633
18 15902968338
19 58107491971
20 212317732888
21 775783501558
22 2834620130881
23 10357363200392
24 37844566834330
25 138279520124262

[1,4,15,56,208,767,2812,10278,37530,137044,500571,
 1828818,6682264,24416877,89218462,325997507,
 1191160160,4352355633,15902968338,58107491971,
 212317732888,775783501558,2834620130881,
 10357363200392,37844566834330,138279520124262]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)