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A181367 as a simple table

n a(n)
1 2
2 6
3 22
4 78
5 272
6 940
7 3232
8 11080
9 37920
10 129648
11 443008
12 1513248
13 5168000
14 17647552
15 60258304
16 205746304
17 702484992
18 2398480128
19 8189016064
20 27959235072
21 95459170304
22 325918735360
23 1112757649408
24 3799195224064

[2,6,22,78,272,940,3232,11080,37920,129648,443008,
 1513248,5168000,17647552,60258304,205746304,
 702484992,2398480128,8189016064,27959235072,
 95459170304,325918735360,1112757649408,
 3799195224064]

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Last modified August 7 14:43 EDT 2020. Contains 336276 sequences. (Running on oeis4.)