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A336630 as a simple table

n a(n)
0 0
1 4
2 18
3 38
4 108
5 274
6 726
7 1892
8 4962
9 12982
10 33996
11 88994
12 232998
13 609988
14 1596978
15 4180934
16 10945836
17 28656562
18 75023862
19 196415012
20 514221186
21 1346248534
22 3524524428
23 9227324738
24 24157449798
25 63245024644
26 165577624146
27 433487847782

[0,4,18,38,108,274,726,1892,4962,12982,33996,
 88994,232998,609988,1596978,4180934,10945836,
 28656562,75023862,196415012,514221186,1346248534,
 3524524428,9227324738,24157449798,63245024644,
 165577624146,433487847782]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)