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A298135 as a simple table

n a(n)
1 0
2 2
3 3
4 10
5 20
6 68
7 185
8 561
9 1600
10 4856
11 14490
12 43334
13 130046
14 390291
15 1172586
16 3523139
17 10593181
18 31854446
19 95807649
20 288198019
21 867005085
22 2608469794
23 7848188504
24 23614061363
25 71053102045
26 213798191069
27 643325960937

[0,2,3,10,20,68,185,561,1600,4856,14490,43334,
 130046,390291,1172586,3523139,10593181,31854446,
 95807649,288198019,867005085,2608469794,
 7848188504,23614061363,71053102045,213798191069,
 643325960937]

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Last modified September 21 01:46 EDT 2021. Contains 347596 sequences. (Running on oeis4.)