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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.

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`%I #7 Apr 21 2024 22:30:05
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`%S 1,252,8864856,40638618022744,23098236228791472696480,
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`%T 1568841035670687222903484318855680,
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`%U 12397389650957442295025809189993580551236444160
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`%N 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.
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`%C Initial terms are {n(n+1)/2}*{A000042(n)}.
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`%e a(1) = 1, a(2) = 12*21 = 252, a(3) = 123*231*312 = 8864856.
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`%Y Cf. A000042, A083956.
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`%K base,nonn
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`%O 1,2
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`%A _Amarnath Murthy_, May 10 2003
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`%E More terms from _David Wasserman_, Dec 03 2004
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