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A060537 as a simple table

n a(n)
0 1
1 21
2 105
3 266
4 1386
5 6678
6 25403
7 100506
8 384678
9 1393903
10 4831890
11 15955485
12 50080478
13 149211930
14 421819950
15 1132236630
16 2890927935
17 7040892159
18 16411041500
19 36733789575
20 79230165105
21 165194651065
22 333926559540

[1,21,105,266,1386,6678,25403,100506,384678,
 1393903,4831890,15955485,50080478,149211930,
 421819950,1132236630,2890927935,7040892159,
 16411041500,36733789575,79230165105,165194651065,
 333926559540]

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Last modified February 27 03:30 EST 2020. Contains 332299 sequences. (Running on oeis4.)