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A018957 as a simple table

n a(n)
2 1
3 12
4 18
5 213
6 868
7 6811
8 40267
9 283800
10 1893581
11 13245343
12 92117860
13 651848468
14 4635906047
15 33287875110
16 240521004903

[1,12,18,213,868,6811,40267,283800,1893581,
 13245343,92117860,651848468,4635906047,
 33287875110,240521004903]

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)