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A027983 as a simple table

n a(n)
0 1
1 5
2 14
3 35
4 81
5 180
6 389
7 825
8 1726
9 3575
10 7349
11 15020
12 30561
13 61965
14 125294
15 252795
16 509161
17 1024100
18 2057549
19 4130225
20 8284926
21 16609455
22 33282989
23 66669660
24 133507081
25 267285605
26 535010414
27 1070731475
28 2142612801

[1,5,14,35,81,180,389,825,1726,3575,7349,15020,
 30561,61965,125294,252795,509161,1024100,2057549,
 4130225,8284926,16609455,33282989,66669660,
 133507081,267285605,535010414,1070731475,
 2142612801]

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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)