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A052913 as a simple table

n a(n)
0 1
1 4
2 18
3 82
4 374
5 1706
6 7782
7 35498
8 161926
9 738634
10 3369318
11 15369322
12 70107974
13 319801226
14 1458790182
15 6654348458
16 30354161926
17 138462112714
18 631602239718
19 2881086973162
20 13142230386374
21 59948977985546
22 273460429154982
23 1247404189803818
24 5690100090709126

[1,4,18,82,374,1706,7782,35498,161926,738634,
 3369318,15369322,70107974,319801226,1458790182,
 6654348458,30354161926,138462112714,631602239718,
 2881086973162,13142230386374,59948977985546,
 273460429154982,1247404189803818,5690100090709126]

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Last modified January 21 11:01 EST 2020. Contains 331105 sequences. (Running on oeis4.)