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A291031 as a simple table

n a(n)
0 3
1 15
2 70
3 321
4 1461
5 6624
6 29967
7 135399
8 611318
9 2758881
10 12447753
11 56154744
12 253306119
13 1142572767
14 5153589754
15 23244956169
16 104843981505
17 472885383744
18 2132882300571
19 9620044596687
20 43389716584682
21 195702453488433
22 882684641446989
23 3981207177094608

[3,15,70,321,1461,6624,29967,135399,611318,
 2758881,12447753,56154744,253306119,1142572767,
 5153589754,23244956169,104843981505,472885383744,
 2132882300571,9620044596687,43389716584682,
 195702453488433,882684641446989,3981207177094608]

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Last modified February 21 01:12 EST 2019. Contains 320364 sequences. (Running on oeis4.)