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A156411 as a simple table

n a(n)
0 1
1 120
2 8940
3 216680
4 1939740
5 7574400
6 18391220
7 48340560
8 133072650
9 294400160
10 636803010
11 1521100320
12 3164432181
13 5269056120
14 9096418860
15 18579992000
16 34459271550
17 49721066400
18 70412760560
19 126260708400
20 215977376730

[1,120,8940,216680,1939740,7574400,18391220,
 48340560,133072650,294400160,636803010,1521100320,
 3164432181,5269056120,9096418860,18579992000,
 34459271550,49721066400,70412760560,126260708400,
 215977376730]

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Last modified September 21 14:42 EDT 2023. Contains 365502 sequences. (Running on oeis4.)