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 A305725 #16 Jun 24 2018 16:44:03 %S A305725 0,1,1,4,19,141,1260,14379,192615,2997844,52869443,1042233820, %T A305725 22685350130,540054008352,13951013617182,388499286052386, %U A305725 11597298980187673,369329248762633105,12495176515326675179,447453508295247538083,16905177062269436114613 %N A305725 a(n) is the n-th term of the sequence that shifts left by one position when Euler transform is applied n times; a(0) = 0. %H A305725 Alois P. Heinz, <a href="/A305725/b305725.txt">Table of n, a(n) for n = 0..200</a> %F A305725 a(n) = A144042(n,n) for n>0, a(0) = 0. %Y A305725 Main diagonal of A144042. %Y A305725 Cf. A290354, A316102. %K A305725 nonn,eigen %O A305725 0,4 %A A305725 _Alois P. Heinz_, Jun 21 2018