This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A083957 #7 Apr 21 2024 22:30:05
%S A083957 1,252,8864856,40638618022744,23098236228791472696480,
%T A083957 1568841035670687222903484318855680,
%U A083957 12397389650957442295025809189993580551236444160
%N A083957 a(n) = product of all cyclic permutation of concatenation of first n numbers. In each case the digits of a number are kept together for n>9.
%C A083957 Initial terms are {n(n+1)/2}*{A000042(n)}.
%e A083957 a(1) = 1, a(2) = 12*21 = 252, a(3) = 123*231*312 = 8864856.
%Y A083957 Cf. A000042, A083956.
%K A083957 base,nonn
%O A083957 1,2
%A A083957 _Amarnath Murthy_, May 10 2003
%E A083957 More terms from _David Wasserman_, Dec 03 2004