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A009105 as a simple table

n a(n)
0 1
1 0
2 4
3 56
4 2192
5 128448
6 11141824
7 1332816512
8 210250492160
9 42290401757184
10 10563624419906560
11 3208072210301966336
12 1164053448822395604992
13 497366043438147538010112
14 247165485059674632625438720

[1,0,4,56,2192,128448,11141824,1332816512,
 210250492160,42290401757184,10563624419906560,
 3208072210301966336,1164053448822395604992,
 497366043438147538010112,
 247165485059674632625438720]

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Last modified February 7 02:40 EST 2023. Contains 360111 sequences. (Running on oeis4.)