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A164342 as a simple table

n a(n)
1 1
2 4
3 9
4 27
5 61
6 185
7 469
8 1456
9 4368
10 14720
11 50800
12 190149
13 735451
14 3001161
15 12659652
16 55462967
17 250186665
18 1163114375
19 5548002866
20 27151477487
21 135968479892
22 696511087808
23 3643182769117
24 19449907766921
25 105843172596610

[1,4,9,27,61,185,469,1456,4368,14720,50800,190149,
 735451,3001161,12659652,55462967,250186665,
 1163114375,5548002866,27151477487,135968479892,
 696511087808,3643182769117,19449907766921,
 105843172596610]

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Last modified December 5 17:42 EST 2019. Contains 329768 sequences. (Running on oeis4.)