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A259274 as a simple table

n a(n)
0 1
1 4
2 12
3 52
4 204
5 804
6 3244
7 12948
8 51756
9 207108
10 828364
11 3313332
12 13253580
13 53014116
14 212055852
15 848224660
16 3392897772
17 13571588484
18 54286358988
19 217145432052
20 868581718860
21 3474326895460
22 13897307565804
23 55589230225428
24 222356920980972
25 889427683862724
26 3557710735299660

[1,4,12,52,204,804,3244,12948,51756,207108,828364,
 3313332,13253580,53014116,212055852,848224660,
 3392897772,13571588484,54286358988,217145432052,
 868581718860,3474326895460,13897307565804,
 55589230225428,222356920980972,889427683862724,
 3557710735299660]

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)