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A004400
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1 + Sum 2^k k!, k = 1 . . n.
(Formerly M1263)
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2
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1, 2, 4, 12, 60, 444, 4284, 50364, 695484, 11017404, 196811964, 3912703164, 85662309564, 2047652863164, 53059407256764, 1481388530277564, 44331262220901564, 1415527220320869564, 48036189795719781564, 1726380042510080613564, 65503446445655792229564, 2616586102571484256869564
(list; graph; refs; listen; history; internal format)
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