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A059138 as a simple table

n a(n)
0 18
1 90
2 270
3 666
4 1494
5 3186
6 6606
7 13482
8 27270
9 54882
10 110142
11 220698
12 441846
13 884178
14 1768878

[18,90,270,666,1494,3186,6606,13482,27270,54882,
 110142,220698,441846,884178,1768878]

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Last modified March 5 11:57 EST 2021. Contains 341823 sequences. (Running on oeis4.)