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A099214 as a simple table

n a(n)
0 1
1 2
2 4
3 12
4 40
5 128
6 400
7 1248
8 3904
9 12224
10 38272
11 119808
12 375040
13 1174016
14 3675136
15 11504640
16 36014080
17 112738304
18 352915456
19 1104764928
20 3458351104
21 10826006528
22 33889681408
23 106088103936
24 332097716224
25 1039597174784

[1,2,4,12,40,128,400,1248,3904,12224,38272,119808,
 375040,1174016,3675136,11504640,36014080,
 112738304,352915456,1104764928,3458351104,
 10826006528,33889681408,106088103936,332097716224,
 1039597174784]

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Last modified September 21 02:47 EDT 2023. Contains 365486 sequences. (Running on oeis4.)