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A061990 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 2
5 12
6 46
7 140
8 344
9 732
10 1400
11 2468
12 4080
13 6404
14 9632
15 13980
16 19688
17 27020
18 36264
19 47732
20 61760
21 78708
22 98960
23 122924
24 151032
25 183740
26 221528
27 264900
28 314384
29 370532
30 433920
31 505148
32 584840
33 673644
34 772232
35 881300
36 1001568
37 1133780
38 1278704
39 1437132

[0,0,0,0,2,12,46,140,344,732,1400,2468,4080,6404,
 9632,13980,19688,27020,36264,47732,61760,78708,
 98960,122924,151032,183740,221528,264900,314384,
 370532,433920,505148,584840,673644,772232,881300,
 1001568,1133780,1278704,1437132]

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Last modified April 25 11:30 EDT 2024. Contains 371967 sequences. (Running on oeis4.)