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A244309 as a simple table

n a(n)
0 0
1 0
2 0
3 4
4 18
5 100
6 448
7 2028
8 8820
9 38148
10 163350
11 697048
12 2965248
13 12595048
14 53440504
15 226608900
16 960530634
17 4070452764
18 17246835648
19 73069580980
20 309555981900
21 1311374255620
22 5555264316910
23 23532984885744
24 99688652356608
25 422291386890000

[0,0,0,4,18,100,448,2028,8820,38148,163350,697048,
 2965248,12595048,53440504,226608900,960530634,
 4070452764,17246835648,73069580980,309555981900,
 1311374255620,5555264316910,23532984885744,
 99688652356608,422291386890000]

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Last modified April 23 23:26 EDT 2024. Contains 371917 sequences. (Running on oeis4.)