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A054718 as a simple table

n a(n)
0 1
1 3
2 6
3 24
4 72
5 240
6 696
7 2184
8 6480
9 19656
10 58800
11 177144
12 530640
13 1594320
14 4780776
15 14348640
16 43040160
17 129140160
18 387400104
19 1162261464
20 3486725280
21 10460350992
22 31380882456
23 94143178824
24 282428998560
25 847288609200
26 2541864234000
27 7625597465304

[1,3,6,24,72,240,696,2184,6480,19656,58800,177144,
 530640,1594320,4780776,14348640,43040160,
 129140160,387400104,1162261464,3486725280,
 10460350992,31380882456,94143178824,282428998560,
 847288609200,2541864234000,7625597465304]

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Last modified May 8 19:26 EDT 2024. Contains 372341 sequences. (Running on oeis4.)