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A107970 as a simple table

n a(n)
0 1
1 21
2 168
3 825
4 3003
5 8918
6 22848
7 52326
8 109725
9 214291
10 394680
11 692055
12 1163799
13 1887900
14 2968064
15 4539612
16 6776217
17 9897537
18 14177800
19 19955397
20 27643539
21 37742034
22 50850240
23 67681250
24 89077365
25 116026911
26 149682456
27 191380483

[1,21,168,825,3003,8918,22848,52326,109725,214291,
 394680,692055,1163799,1887900,2968064,4539612,
 6776217,9897537,14177800,19955397,27643539,
 37742034,50850240,67681250,89077365,116026911,
 149682456,191380483]

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Last modified August 12 00:34 EDT 2022. Contains 356067 sequences. (Running on oeis4.)