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A030278 as a simple table

n a(n)
1 4
2 18
3 86
4 393
5 1790
6 7918
7 34047
8 142442
9 582768
10 2344913
11 9330350
12 36842164
13 144611963
14 564509442
15 2191142528
16 8453688007
17 32411106626
18 123493645782
19 467831766283
20 1763390759650
21 6619106543024
22 24762942068363
23 92393401202050
24 343951336690542

[4,18,86,393,1790,7918,34047,142442,582768,
 2344913,9330350,36842164,144611963,564509442,
 2191142528,8453688007,32411106626,123493645782,
 467831766283,1763390759650,6619106543024,
 24762942068363,92393401202050,343951336690542]

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Last modified March 29 03:41 EDT 2024. Contains 371264 sequences. (Running on oeis4.)