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A071757 as a simple table

n a(n)
0 1
1 4
2 14
3 48
4 166
5 580
6 2046
7 7280
8 26104
9 94248
10 342380
11 1250656
12 4591122
13 16929380
14 62678910
15 232916400
16 868434000
17 3247943160
18 12181647780
19 45807142560
20 172664906700
21 652291953768
22 2469325506252
23 9365937951328

[1,4,14,48,166,580,2046,7280,26104,94248,342380,
 1250656,4591122,16929380,62678910,232916400,
 868434000,3247943160,12181647780,45807142560,
 172664906700,652291953768,2469325506252,
 9365937951328]

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Last modified April 25 04:42 EDT 2024. Contains 371964 sequences. (Running on oeis4.)