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A218989 as a simple table

n a(n)
0 5
1 25
2 121
3 585
4 2825
5 13641
6 65865
7 318025
8 1535561
9 7414345
10 35799625
11 172855881
12 834622025
13 4029911625
14 19458134601
15 93952184905
16 453641278025
17 2190373851721
18 10576060518985
19 51065737482825
20 246567192007241
21 1190531717960265
22 5748395639870025

[5,25,121,585,2825,13641,65865,318025,1535561,
 7414345,35799625,172855881,834622025,4029911625,
 19458134601,93952184905,453641278025,
 2190373851721,10576060518985,51065737482825,
 246567192007241,1190531717960265,5748395639870025]

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Last modified March 24 01:20 EDT 2019. Contains 321444 sequences. (Running on oeis4.)