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A223778 as a simple table

n a(n)
1 7
2 53
3 330
4 1809
5 8940
6 41257
7 180670
8 756800
9 3066706
10 12093628
11 46563397
12 175879412
13 653526033
14 2392564820
15 8651185991
16 30941217363
17 109551653219
18 384528798543
19 1339204256650
20 4630162104037
21 15905909415604
22 54322204287215 

[7,53,330,1809,8940,41257,180670,756800,3066706,
 12093628,46563397,175879412,653526033,2392564820,
 8651185991,30941217363,109551653219,384528798543,
 1339204256650,4630162104037,15905909415604,
 54322204287215]

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Last modified April 15 23:55 EDT 2024. Contains 371696 sequences. (Running on oeis4.)