1,1
Eric Weisstein's World of Mathematics, Bell Number
Sum of all 1-digit Bell numbers is 9.
Sum of all 2-digit Bell numbers is 67.
Sum of all 3-digit Bell numbers is 1080.
Cf. A000110.
Sequence in context: A016130 A115202 A002051 this_sequence A048742 A121633 A091708
Adjacent sequences: A133117 A133118 A133119 this_sequence A133121 A133122 A133123
nonn,base
Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 18 2007
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