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A257272 as a simple table

n a(n)
0 4
1 9
2 22
3 60
4 184
5 624
6 2272
7 8640
8 33664
9 132864
10 527872
11 2104320
12 8402944
13 33583104
14 134275072
15 536985600
16 2147713024
17 8590393344
18 34360655872
19 137440788480
20 549759483904
21 2199030595584
22 8796107702272
23 35184401448960
24 140737547075584
25 562950070861824
26 2251800048566272
27 9007199724503040

[4,9,22,60,184,624,2272,8640,33664,132864,527872,
 2104320,8402944,33583104,134275072,536985600,
 2147713024,8590393344,34360655872,137440788480,
 549759483904,2199030595584,8796107702272,
 35184401448960,140737547075584,562950070861824,
 2251800048566272,9007199724503040]

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Last modified May 30 05:35 EDT 2020. Contains 334712 sequences. (Running on oeis4.)