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A156431 as a simple table

n a(n)
2 1
3 0
4 2
5 0
6 12
7 0
8 90
9 0
10 810
11 0
12 8940
13 0
14 116760
15 0
16 1756860
17 0
18 29933820
19 0
20 569744280
21 0
22 11981526480
23 0
24 275893362360
25 0
26 6903968231160
27 0
28 186558764792400
29 0
30 5413973807642400

[1,0,2,0,12,0,90,0,810,0,8940,0,116760,0,1756860,
 0,29933820,0,569744280,0,11981526480,0,
 275893362360,0,6903968231160,0,186558764792400,0,
 5413973807642400]

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)