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A231950 as a simple table

n a(n)
1 4
2 18
3 64
4 236
5 888
6 3336
7 12512
8 46928
9 176032
10 660320
11 2476928
12 9291200
13 34852224
14 130734208
15 490397184
16 1839529216
17 6900259328
18 25883567616
19 97091868672
20 364201376768
21 1366156040192
22 5124588881920
23 19222848954368
24 72106842214400

[4,18,64,236,888,3336,12512,46928,176032,660320,
 2476928,9291200,34852224,130734208,490397184,
 1839529216,6900259328,25883567616,97091868672,
 364201376768,1366156040192,5124588881920,
 19222848954368,72106842214400]

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Last modified November 15 21:37 EST 2019. Contains 329168 sequences. (Running on oeis4.)