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A006252 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 4
5 14
6 38
7 216
8 600
9 6240
10 9552
11 319296
12 -519312
13 28108560
14 -176474352
15 3998454144
16 -43985078784
17 837126163584
18 -12437000028288
19 237195036797184
20 -4235955315745536
21 85886259443020800
22 -1746536474655406080
23 38320721602434017280
24 -864056965711935974400

[1,1,1,2,4,14,38,216,600,6240,9552,319296,-519312,
 28108560,-176474352,3998454144,-43985078784,
 837126163584,-12437000028288,237195036797184,
 -4235955315745536,85886259443020800,
 -1746536474655406080,38320721602434017280,
 -864056965711935974400]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)