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A247409 as a simple table

n a(n)
1 0
2 40
3 528
4 14456
5 132368
6 775668
7 3385192
8 13124760
9 41711352
10 123222780
11 322279484
12 779176460
13 1746083264
14 3710742916
15 7434986372
16 14291613796
17 26308317500
18 46795105776
19 80481695004
20 134719014924
21 219309670828

[0,40,528,14456,132368,775668,3385192,13124760,
 41711352,123222780,322279484,779176460,1746083264,
 3710742916,7434986372,14291613796,26308317500,
 46795105776,80481695004,134719014924,219309670828]

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Last modified March 3 08:35 EST 2024. Contains 370499 sequences. (Running on oeis4.)