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A220456 as a simple table

n a(n)
1 2
2 4
3 22
4 74
5 250
6 848
7 2851
8 9535
9 31888
10 106775
11 357028
12 1193927
13 3992279
14 13348541
15 44630321
16 149215567
17 498878032
18 1667898396
19 5576255601
20 18642932177
21 62328230082
22 208379401186
23 696665636518
24 2329130179184
25 7786871066006

[2,4,22,74,250,848,2851,9535,31888,106775,357028,
 1193927,3992279,13348541,44630321,149215567,
 498878032,1667898396,5576255601,18642932177,
 62328230082,208379401186,696665636518,
 2329130179184,7786871066006]

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Last modified April 21 06:29 EDT 2024. Contains 371850 sequences. (Running on oeis4.)