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A321554 as a simple table

n a(n)
1 1
2 511
3 19684
4 261631
5 1953126
6 10058524
7 40353608
8 133955071
9 387440173
10 998047386
11 2357947692
12 5149944604
13 10604499374
14 20620693688
15 38445332184
16 68584996351
17 118587876498
18 197981928403
19 322687697780
20 510998308506
21 794320419872
22 1204911270612
23 1801152661464
24 2636771617564
25 3814699218751

[1,511,19684,261631,1953126,10058524,40353608,
 133955071,387440173,998047386,2357947692,
 5149944604,10604499374,20620693688,38445332184,
 68584996351,118587876498,197981928403,
 322687697780,510998308506,794320419872,
 1204911270612,1801152661464,2636771617564,
 3814699218751]

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Last modified January 29 01:54 EST 2020. Contains 331328 sequences. (Running on oeis4.)