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A126921 as a simple table

n a(n)
0 1
1 28
2 392
3 3668
4 25732
5 144060
6 670488
7 2672852
8 9344328
9 29209292
10 82958120
11 216938148
12 528131212
13 1207976588
14 2615828152
15 5397362180
16 10669093008
17 20297542972
18 37310805448
19 66491509812
20 115213838740
21 194603575068
22 321119500632
23 518677185908
24 821462669272

[1,28,392,3668,25732,144060,670488,2672852,
 9344328,29209292,82958120,216938148,528131212,
 1207976588,2615828152,5397362180,10669093008,
 20297542972,37310805448,66491509812,115213838740,
 194603575068,321119500632,518677185908,
 821462669272]

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)