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A151254 as a simple table

n a(n)
0 1
1 4
2 20
3 96
4 480
5 2368
6 11840
7 58880
8 294400
9 1468416
10 7342080
11 36667392
12 183336960
13 916144128
14 4580720640
15 22896574464
16 114482872320
17 572320645120
18 2861603225600
19 14306741583872
20 71533707919360
21 357650927714304
22 1788254638571520
23 8941026626502656
24 44705133132513280
25 223522175800311808

[1,4,20,96,480,2368,11840,58880,294400,1468416,
 7342080,36667392,183336960,916144128,4580720640,
 22896574464,114482872320,572320645120,
 2861603225600,14306741583872,71533707919360,
 357650927714304,1788254638571520,8941026626502656,
 44705133132513280,223522175800311808]

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Last modified April 25 11:06 EDT 2024. Contains 371967 sequences. (Running on oeis4.)