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A061998 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 1974
6 42368
7 397014
8 2326320
9 10087628
10 35464464
11 106783320
12 285336128
13 693331146
14 1558986816
15 3286192514
16 6558317232
17 12488282352
18 22829958032
19 40269324564
20 68817690624
21 114333609854
22 185205015936

[0,0,0,0,0,1974,42368,397014,2326320,10087628,
 35464464,106783320,285336128,693331146,1558986816,
 3286192514,6558317232,12488282352,22829958032,
 40269324564,68817690624,114333609854,185205015936]

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Last modified May 28 21:13 EDT 2024. Contains 372920 sequences. (Running on oeis4.)