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A207758 as a simple table

n a(n)
1 9
2 81
3 221
4 663
5 2245
6 6459
7 17563
8 48649
9 131269
10 344873
11 902075
12 2342619
13 6021103
14 15395621
15 39219821
16 99470227
17 251449497
18 634148313
19 1595707571
20 4007571389
21 10049914241
22 25169768531
23 62965428327
24 157368593823
25 392995561393

[9,81,221,663,2245,6459,17563,48649,131269,344873,
 902075,2342619,6021103,15395621,39219821,99470227,
 251449497,634148313,1595707571,4007571389,
 10049914241,25169768531,62965428327,157368593823,
 392995561393]

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Last modified September 24 23:43 EDT 2022. Contains 356951 sequences. (Running on oeis4.)