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A027182 as a simple table

n a(n)
0 18
1 150
2 820
3 3726
4 15492
5 61660
6 240328
7 928110
8 3572692
9 13749580
10 52977216
11 204478276
12 790747504
13 3063728856
14 11891504944
15 46231328174
16 180005765748
17 701823431740
18 2739725128448
19 10707198384348
20 41888225645152
21 164027934617024

[18,150,820,3726,15492,61660,240328,928110,
 3572692,13749580,52977216,204478276,790747504,
 3063728856,11891504944,46231328174,180005765748,
 701823431740,2739725128448,10707198384348,
 41888225645152,164027934617024]

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Last modified August 5 06:46 EDT 2020. Contains 336209 sequences. (Running on oeis4.)