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A208309 as a simple table

n a(n)
1 4
2 18
3 78
4 336
5 1446
6 6222
7 26772
8 115194
9 495654
10 2132688
11 9176478
12 39484326
13 169892196
14 731008002
15 3145363422
16 13533793104
17 58232875254
18 250562996958
19 1078116359028
20 4638892804266
21 19960114944246
22 85883896308432

[4,18,78,336,1446,6222,26772,115194,495654,
 2132688,9176478,39484326,169892196,731008002,
 3145363422,13533793104,58232875254,250562996958,
 1078116359028,4638892804266,19960114944246,
 85883896308432]

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Last modified November 29 13:28 EST 2022. Contains 358430 sequences. (Running on oeis4.)