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A222670 as a simple table

n a(n)
1 4
2 24
3 90
4 2370
5 17696
6 426362
7 4030527
8 115311310
9 1138939624
10 33371066606
11 333504416113
12 9869885381863
13 98742842374798
14 2936314625332784
15 29380754050688425
16 877025222448714052
17 8774880700816611500

[4,24,90,2370,17696,426362,4030527,115311310,
 1138939624,33371066606,333504416113,9869885381863,
 98742842374798,2936314625332784,29380754050688425,
 877025222448714052,8774880700816611500]

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Last modified July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)