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A180778 as a simple table

n a(n)
1 0
2 0
3 9
4 198
5 2294
6 19467
7 126864
8 674922
9 2997717
10 11615754
11 39660995
12 123162204
13 348412638
14 920581314
15 2264397902
16 5294830516
17 11692554408
18 24858751383
19 50403391227
20 99282023930
21 187902783369
22 347689331443
23 621482071507

[0,0,9,198,2294,19467,126864,674922,2997717,
 11615754,39660995,123162204,348412638,920581314,
 2264397902,5294830516,11692554408,24858751383,
 50403391227,99282023930,187902783369,347689331443,
 621482071507]

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Last modified August 13 11:30 EDT 2022. Contains 356091 sequences. (Running on oeis4.)