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A067980 as a simple table

n a(n)
0 3
1 13
2 31
3 69
4 140
5 274
6 519
7 963
8 1757
9 3165
10 5642
11 9972
12 17499
13 30521
14 52955
15 91461
16 157336
17 269702
18 460863
19 785295
20 1334713
21 2263293
22 3829846
23 6468264
24 10905075
25 18355429
26 30849559
27 51776133
28 86785892

[3,13,31,69,140,274,519,963,1757,3165,5642,9972,
 17499,30521,52955,91461,157336,269702,460863,
 785295,1334713,2263293,3829846,6468264,10905075,
 18355429,30849559,51776133,86785892]

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Last modified June 20 16:59 EDT 2024. Contains 373530 sequences. (Running on oeis4.)