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A270853 as a simple table

n a(n)
1 0
2 0
3 252
4 6822
5 108348
6 1144464
7 8559378
8 49511370
9 225803628
10 868915644
11 2866094766
12 8402366160
13 22207133946
14 53934812124
15 121777854570
16 258248878044
17 519141258054
18 994719606876
19 1830153826026
20 3242675095548
21 5566018125510

[0,0,252,6822,108348,1144464,8559378,49511370,
 225803628,868915644,2866094766,8402366160,
 22207133946,53934812124,121777854570,258248878044,
 519141258054,994719606876,1830153826026,
 3242675095548,5566018125510]

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Last modified April 24 15:57 EDT 2024. Contains 371961 sequences. (Running on oeis4.)