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A264927 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 81
5 396
6 1936
7 9416
8 45796
9 234972
10 1205604
11 6188328
12 31764496
13 162249168
14 828748944
15 4224034452
16 21529399441
17 113085801048
18 593996986944
19 3126735424128
20 16458794619136
21 86717178000000
22 456890625000000
23 2407551579000000
24 12686416153856064
25 66648950832253248
26 350144800010358336
27 1838080630013808960
28 9648980656951105600
29 50559912359694495680

[1,1,4,18,81,396,1936,9416,45796,234972,1205604,
 6188328,31764496,162249168,828748944,4224034452,
 21529399441,113085801048,593996986944,
 3126735424128,16458794619136,86717178000000,
 456890625000000,2407551579000000,
 12686416153856064,66648950832253248,
 350144800010358336,1838080630013808960,
 9648980656951105600,50559912359694495680]

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Last modified April 20 03:53 EDT 2024. Contains 371798 sequences. (Running on oeis4.)