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 A127422 #21 Mar 29 2017 09:47:39 %S A127422 12,123,234,345,456,567,678,789,8910,91011,101112,111213,121314, %T A127422 131415,141516,151617,161718,171819,181920,192021,202122,212223, %U A127422 222324,232425,242526,252627,262728,272829,282930,293031,303132,313233,323334,333435,343536,353637,363738,373839,383940,394041 %N A127422 Duplicate of A001703. %K A127422 dead %O A127422 0,1