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A026642 as a simple table

n a(n)
2 1
3 7
4 28
5 112
6 439
7 1711
8 6652
9 25846
10 100450
11 390670
12 1520764
13 5925718
14 23112931
15 90239407
16 352654084
17 1379410438
18 5400188206
19 21157958962
20 82959736504
21 325514137048
22 1278093308806
23 5021436970822
24 19740128055928

[1,7,28,112,439,1711,6652,25846,100450,390670,
 1520764,5925718,23112931,90239407,352654084,
 1379410438,5400188206,21157958962,82959736504,
 325514137048,1278093308806,5021436970822,
 19740128055928]

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Last modified August 10 04:38 EDT 2020. Contains 336368 sequences. (Running on oeis4.)