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 A247056 #11 Jan 25 2019 08:30:31 %S A247056 1,1,4,19,116,925,9286,110131,1487144,22607353,384379370 %N A247056 Number of endofunctions on [n] that are the 9th power of an endofunction. %e A247056 a(3) = 19: (1,1,1), (1,1,3), (1,2,1), (1,2,2), (1,2,3), (1,3,2), (1,3,3), (2,1,1), (2,1,2), (2,1,3), (2,2,2), (2,2,3), (2,3,2), (3,1,1), (3,2,1), (3,2,3), (3,3,1), (3,3,2), (3,3,3). %Y A247056 Column k=9 of A247026. %K A247056 nonn,more %O A247056 0,3 %A A247056 _Alois P. Heinz_, Sep 10 2014 %E A247056 a(8)-a(10) from _Bert Dobbelaere_, Jan 25 2019