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A145563 as a simple table

n a(n)
0 0
1 4
2 20
3 76
4 260
5 844
6 2660
7 8236
8 25220
9 76684
10 232100
11 700396
12 2109380
13 6344524
14 19066340
15 57264556
16 171924740
17 516036364
18 1548633380
19 4646948716
20 13942943300
21 41833024204
22 125507461220
23 376539160876
24 1129651037060
25 3389020220044
26 10167194877860

[0,4,20,76,260,844,2660,8236,25220,76684,232100,
 700396,2109380,6344524,19066340,57264556,
 171924740,516036364,1548633380,4646948716,
 13942943300,41833024204,125507461220,376539160876,
 1129651037060,3389020220044,10167194877860]

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)