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A023872 as a simple table

n a(n)
0 1
1 1
2 9
3 36
4 136
5 477
6 1703
7 5746
8 19099
9 61622
10 195366
11 607069
12 1856516
13 5586870
14 16579850
15 48549116
16 140438966
17 401592524
18 1136121837
19 3181700219
20 8825733603
21 24261363403
22 66124058839
23 178757752892
24 479513547399
25 1276792213203
26 3375707760306
27 8864712158225

[1,1,9,36,136,477,1703,5746,19099,61622,195366,
 607069,1856516,5586870,16579850,48549116,
 140438966,401592524,1136121837,3181700219,
 8825733603,24261363403,66124058839,178757752892,
 479513547399,1276792213203,3375707760306,
 8864712158225]

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Last modified April 11 21:52 EDT 2021. Contains 342888 sequences. (Running on oeis4.)