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A027958 as a simple table

n a(n)
1 1
2 1
3 4
4 5
5 20
6 32
7 95
8 169
9 424
10 793
11 1816
12 3488
13 7583
14 14789
15 31172
16 61357
17 126892
18 251200
19 513343
20 1019921
21 2068496
22 4119281
23 8313584
24 16580800
25 33358015
26 66594637
27 133703500
28 267089189
29 535524644
30 1070217248
31 2143959071

[1,1,4,5,20,32,95,169,424,793,1816,3488,7583,
 14789,31172,61357,126892,251200,513343,1019921,
 2068496,4119281,8313584,16580800,33358015,
 66594637,133703500,267089189,535524644,1070217248,
 2143959071]

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Last modified March 28 15:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)