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A240365 as a simple table

n a(n)
1 4
2 15
3 51
4 188
5 672
6 2452
7 8822
8 32077
9 115811
10 420299
11 1519980
12 5510943
13 19945570
14 72279704
15 261698918
16 948113920
17 3433420924
18 12437397618
19 45043913721
20 163158785746
21 590931290044
22 2140411544446
23 7752356423111
24 28079348085009

[4,15,51,188,672,2452,8822,32077,115811,420299,
 1519980,5510943,19945570,72279704,261698918,
 948113920,3433420924,12437397618,45043913721,
 163158785746,590931290044,2140411544446,
 7752356423111,28079348085009]

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)