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A252823 as a simple table

n a(n)
1 4
2 18
3 81
4 340
5 1238
6 3891
7 10761
8 26764
9 60988
10 129236
11 257653
12 487744
13 883142
14 1538541
15 2591269
16 4236040
17 6743492
18 10483190
19 15951849
20 23807612
21 34911302
22 50375655
23 71623633
24 100457012
25 139136540
26 190475064
27 257945133
28 345802696

[4,18,81,340,1238,3891,10761,26764,60988,129236,
 257653,487744,883142,1538541,2591269,4236040,
 6743492,10483190,15951849,23807612,34911302,
 50375655,71623633,100457012,139136540,190475064,
 257945133,345802696]

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Last modified July 20 23:17 EDT 2024. Contains 374461 sequences. (Running on oeis4.)