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A181860 as a simple table

n a(n)
0 0
1 1
2 4
3 18
4 48
5 150
6 180
7 980
8 2240
9 5670
10 6300
11 30492
12 11088
13 156156
14 168168
15 257400
16 1647360
17 3719430
18 3938220
19 17551820
20 18475600
21 81477396
22 85357272
23 373173528
24 389398464
25 1690097500
26 1757701400
27 7582037400
28 3931426800
29 33738060600

[0,1,4,18,48,150,180,980,2240,5670,6300,30492,
 11088,156156,168168,257400,1647360,3719430,
 3938220,17551820,18475600,81477396,85357272,
 373173528,389398464,1690097500,1757701400,
 7582037400,3931426800,33738060600]

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)