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A135159 as a simple table

n a(n)
0 1
1 4
2 20
3 106
4 560
5 2914
6 14960
7 76066
8 384320
9 1933954
10 9707600
11 48653026
12 243613280
13 1219116994
14 6098749040
15 30503261986
16 152544909440
17 762810444034
18 3814310107280
19 19072324590946
20 95363945904800
21 476826699947074
22 2384154414150320
23 11920834820287906
24 59604362362631360
25 298022376621898114

[1,4,20,106,560,2914,14960,76066,384320,1933954,
 9707600,48653026,243613280,1219116994,6098749040,
 30503261986,152544909440,762810444034,
 3814310107280,19072324590946,95363945904800,
 476826699947074,2384154414150320,
 11920834820287906,59604362362631360,
 298022376621898114]

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)