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A100307 as a simple table

n a(n)
0 1
1 4
2 10
3 40
4 82
5 328
6 820
7 3280
8 6562
9 26248
10 65620
11 262480
12 538084
13 2152336
14 5380840
15 21523360
16 43046722
17 172186888
18 430467220
19 1721868880
20 3529831204
21 14119324816
22 35298312040
23 141193248160
24 282472589764
25 1129890359056

[1,4,10,40,82,328,820,3280,6562,26248,65620,
 262480,538084,2152336,5380840,21523360,43046722,
 172186888,430467220,1721868880,3529831204,
 14119324816,35298312040,141193248160,282472589764,
 1129890359056]

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Last modified August 8 05:50 EDT 2020. Contains 336290 sequences. (Running on oeis4.)