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A025180 as a simple table

n a(n)
2 1
3 2
4 7
5 20
6 60
7 176
8 518
9 1520
10 4461
11 13090
12 38423
13 112828
14 331487
15 974442
16 2866125
17 8434992
18 24838275
19 73181142
20 215729781
21 636275820
22 1877569134
23 5543095404
24 16372140876
25 48377825216
26 143009973875
27 422918975726
28 1251154692297

[1,2,7,20,60,176,518,1520,4461,13090,38423,112828,
 331487,974442,2866125,8434992,24838275,73181142,
 215729781,636275820,1877569134,5543095404,
 16372140876,48377825216,143009973875,422918975726,
 1251154692297]

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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)