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A061278 as a simple table

n a(n)
0 0
1 1
2 5
3 20
4 76
5 285
6 1065
7 3976
8 14840
9 55385
10 206701
11 771420
12 2878980
13 10744501
14 40099025
15 149651600
16 558507376
17 2084377905
18 7779004245
19 29031639076
20 108347552060
21 404358569165
22 1509086724601
23 5631988329240
24 21018866592360
25 78443478040201
26 292755045568445

[0,1,5,20,76,285,1065,3976,14840,55385,206701,
 771420,2878980,10744501,40099025,149651600,
 558507376,2084377905,7779004245,29031639076,
 108347552060,404358569165,1509086724601,
 5631988329240,21018866592360,78443478040201,
 292755045568445]

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)