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A251840 as a simple table

n a(n)
1 641
2 828
3 1803
4 2890
5 8582
6 21748
7 40492
8 128431
9 339592
10 639794
11 2087597
12 5632271
13 10609658
14 35199882
15 96069006
16 180868454
17 605781397
18 1663988392
19 3131743910
20 10543905961
21 29063878897
22 54690404276
23 184648426284
24 509929622436

[641,828,1803,2890,8582,21748,40492,128431,339592,
 639794,2087597,5632271,10609658,35199882,96069006,
 180868454,605781397,1663988392,3131743910,
 10543905961,29063878897,54690404276,184648426284,
 509929622436]

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Last modified September 22 17:16 EDT 2020. Contains 337291 sequences. (Running on oeis4.)