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A207121 as a simple table

n a(n)
1 21
2 441
3 2499
4 14161
5 49861
6 175561
7 475984
8 1290496
9 2958144
10 6780816
11 13816824
12 28153636
13 52561236
14 98128836
15 171205398
16 298702089
17 493723461
18 816073489
19 1290571359
20 2040961329
21 3110933397
22 4741837321
23 7005780418
24 10350620644

[21,441,2499,14161,49861,175561,475984,1290496,
 2958144,6780816,13816824,28153636,52561236,
 98128836,171205398,298702089,493723461,816073489,
 1290571359,2040961329,3110933397,4741837321,
 7005780418,10350620644]

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Last modified March 30 00:41 EDT 2020. Contains 333117 sequences. (Running on oeis4.)