A129933 a(n) = (n*(n+1)/2+1)!/n!.
1, 2, 12, 840, 1663200, 174356582400, 1561112121913344000, 1754317855900734514790400000, 341362923889542287855059017400320000000, 15163751542692044063740921044974247390216192000000000, 195932150519417838363658963697014150610807423633478962380800000000000
Offset: 0
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Mathematica
Table[(n (n+1)/2+1)!/n!,{n,0,20}] (* Harvey P. Dale, Aug 04 2022 *)