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A026963 as a simple table

n a(n)
2 1
3 8
4 52
5 224
6 987
7 3980
8 16057
9 63732
10 252424
11 996332
12 3927977
13 15471622
14 60915547
15 239794516
16 943946193
17 3716205884
18 14632901696
19 57631689776
20 227042423404
21 894698122022
22 3526753844436
23 13906101471344
24 54848887043366
25 216402159510134
26 854053133294062
27 3371593602442500

[1,8,52,224,987,3980,16057,63732,252424,996332,
 3927977,15471622,60915547,239794516,943946193,
 3716205884,14632901696,57631689776,227042423404,
 894698122022,3526753844436,13906101471344,
 54848887043366,216402159510134,854053133294062,
 3371593602442500]

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Last modified January 27 18:40 EST 2022. Contains 350611 sequences. (Running on oeis4.)