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A149428 as a simple table

n a(n)
0 1
1 1
2 4
3 13
4 44
5 156
6 560
7 2049
8 7684
9 28772
10 108368
11 412396
12 1573776
13 6029488
14 23226176
15 89573577
16 346281380
17 1343190436
18 5216949776
19 20296197484
20 79131832976
21 308798743728
22 1206495306816
23 4720960267204
24 18487515792272
25 72463886990864
26 284340829780288
27 1116404838166192
28 4386449721693760

[1,1,4,13,44,156,560,2049,7684,28772,108368,
 412396,1573776,6029488,23226176,89573577,
 346281380,1343190436,5216949776,20296197484,
 79131832976,308798743728,1206495306816,
 4720960267204,18487515792272,72463886990864,
 284340829780288,1116404838166192,4386449721693760]

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Last modified April 24 10:11 EDT 2024. Contains 371935 sequences. (Running on oeis4.)