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A222511 as a simple table

n a(n)
1 0
2 4
3 4
4 15
5 35
6 170
7 441
8 2192
9 5416
10 26660
11 66209
12 328121
13 816736
14 4074688
15 10172187
16 51053330
17 127212627
18 643151980
19 1598614930
20 8135779154
21 20183768037
22 103256080822
23 255983883834
24 1314494576457
25 3259213240495
26 16780895442470

[0,4,4,15,35,170,441,2192,5416,26660,66209,328121,
 816736,4074688,10172187,51053330,127212627,
 643151980,1598614930,8135779154,20183768037,
 103256080822,255983883834,1314494576457,
 3259213240495,16780895442470]

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Last modified June 25 02:21 EDT 2024. Contains 373691 sequences. (Running on oeis4.)