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A255611 as a simple table

n a(n)
0 1
1 4
2 18
3 64
4 215
5 660
6 1938
7 5400
8 14527
9 37728
10 95278
11 234344
12 563506
13 1326796
14 3066040
15 6963048
16 15564661
17 34282360
18 74486376
19 159785472
20 338703796
21 709957616
22 1472529670
23 3023894672
24 6151408852
25 12402137024
26 24792822174
27 49162962280
28 96737562642

[1,4,18,64,215,660,1938,5400,14527,37728,95278,
 234344,563506,1326796,3066040,6963048,15564661,
 34282360,74486376,159785472,338703796,709957616,
 1472529670,3023894672,6151408852,12402137024,
 24792822174,49162962280,96737562642]

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Last modified October 13 23:39 EDT 2019. Contains 327983 sequences. (Running on oeis4.)