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A221497 as a simple table

n a(n)
1 21
2 1710
3 111042
4 6665056
5 395300442
6 23379869304
7 1381866811158
8 81660873888001
9 4825499982295392
10 285144924466505894
11 16849527299447930632
12 995656384811045493493
13 58834377870789427971005
14 3476584807285468469286548 

[21,1710,111042,6665056,395300442,23379869304,
 1381866811158,81660873888001,4825499982295392,
 285144924466505894,16849527299447930632,
 995656384811045493493,58834377870789427971005,
 3476584807285468469286548]

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Last modified April 25 10:01 EDT 2024. Contains 371967 sequences. (Running on oeis4.)