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A026964 as a simple table

n a(n)
3 1
4 12
5 77
6 434
7 1978
8 8830
9 37409
10 156474
11 644305
12 2632506
13 10684360
14 43166246
15 173768764
16 697596990
17 2794438513
18 11174809302
19 44626341136
20 178018744896
21 709505830530
22 2825762505810
23 11247704919634
24 44749537493028
25 177970696795672
26 707580176408854
27 2812524327414647

[1,12,77,434,1978,8830,37409,156474,644305,
 2632506,10684360,43166246,173768764,697596990,
 2794438513,11174809302,44626341136,178018744896,
 709505830530,2825762505810,11247704919634,
 44749537493028,177970696795672,707580176408854,
 2812524327414647]

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Last modified January 23 17:33 EST 2022. Contains 350514 sequences. (Running on oeis4.)