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A207684 as a simple table

n a(n)
1 9
2 81
3 166
4 436
5 964
6 2132
7 4846
8 11301
9 25496
10 57407
11 131250
12 299913
13 680860
14 1542076
15 3516426
16 8019977
17 18194846
18 41334779
19 94226716
20 214384000
21 486836482
22 1107706812
23 2522185912
24 5733889814
25 13035303238
26 29665346161
27 67490142684

[9,81,166,436,964,2132,4846,11301,25496,57407,
 131250,299913,680860,1542076,3516426,8019977,
 18194846,41334779,94226716,214384000,486836482,
 1107706812,2522185912,5733889814,13035303238,
 29665346161,67490142684]

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Last modified May 24 18:27 EDT 2022. Contains 354043 sequences. (Running on oeis4.)