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A018967 as a simple table

n a(n)
2 3
3 7
4 40
5 181
6 767
7 4629
8 31167
9 202271
10 1304340
11 8492018
12 56259299
13 378024920
14 2561925846
15 17484177731
16 120161533252 

[3,7,40,181,767,4629,31167,202271,1304340,8492018,
 56259299,378024920,2561925846,17484177731,
 120161533252]

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Last modified September 3 17:55 EDT 2024. Contains 375674 sequences. (Running on oeis4.)