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A151028 as a simple table

n a(n)
0 1
1 2
2 10
3 40
4 200
5 888
6 4440
7 20640
8 103200
9 491072
10 2455360
11 11842560
12 59212800
13 288052864
14 1440264320
15 7047424000
16 35237120000
17 173139514368
18 865697571840
19 4266803935232
20 21334019676160
21 105398337126400
22 526991685632000
23 2608355721134080
24 13041778605670400
25 64645756083503104
26 323228780417515520

[1,2,10,40,200,888,4440,20640,103200,491072,
 2455360,11842560,59212800,288052864,1440264320,
 7047424000,35237120000,173139514368,865697571840,
 4266803935232,21334019676160,105398337126400,
 526991685632000,2608355721134080,
 13041778605670400,64645756083503104,
 323228780417515520]

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Last modified April 26 12:36 EDT 2024. Contains 371997 sequences. (Running on oeis4.)