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A002057 as a simple table

n a(n)
0 1
1 4
2 14
3 48
4 165
5 572
6 2002
7 7072
8 25194
9 90440
10 326876
11 1188640
12 4345965
13 15967980
14 58929450
15 218349120
16 811985790
17 3029594040
18 11338026180
19 42550029600
20 160094486370
21 603784920024
22 2282138106804
23 8643460269248
24 32798844771700
25 124680849918352

[1,4,14,48,165,572,2002,7072,25194,90440,326876,
 1188640,4345965,15967980,58929450,218349120,
 811985790,3029594040,11338026180,42550029600,
 160094486370,603784920024,2282138106804,
 8643460269248,32798844771700,124680849918352]

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Last modified February 23 03:41 EST 2018. Contains 299473 sequences. (Running on oeis4.)