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A199938 as a simple table

n a(n)
1 6
2 30
3 142
4 660
5 3042
6 13890
7 63260
8 287514
9 1305394
10 5924042
11 26877500
12 121920302
13 553009230
14 2508114154
15 11375127276
16 51589452156 

[6,30,142,660,3042,13890,63260,287514,1305394,
 5924042,26877500,121920302,553009230,2508114154,
 11375127276,51589452156]

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Last modified May 27 13:23 EDT 2024. Contains 372861 sequences. (Running on oeis4.)