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%I #6 Aug 23 2014 15:16:02
%S 0,10,117,1210,12225,122736,1229527,12305358,123093909,12342050110,
%T 1234527974211,123456310099512,12345672683090413,1234567803832830114,
%U 123456787793437763415,12345678889188423253516
%N Concatenation of first n numbers - n!. a(n) = 1234567891011... up to n - 1*2*3*4*5*6*7*8*9*10*11... up to n.
%F a(n) = A007908(n) - A000142(n). - _David Wasserman_, Nov 09 2004
%e a(6) = 123456-720=122736.
%K base,easy,nonn
%O 1,2
%A _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 01 2003
%E More terms from _David Wasserman_, Nov 09 2004