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 A078939 #3 Mar 30 2012 18:36:32
%S A078939 1,4,1,20,8,1,116,60,12,1,756,464,120,16,1,5428,3780,1160,200,20,1,
%T A078939 42356,32568,11340,2320,300,24,1,355636,296492,113988,26460,4060,420,
%U A078939 28,1,3188340,2845088,1185968,303968,52920,6496,560,32,1,30333492,28695060
%N A078939 Fourth power of lower triangular matrix of A056857 (successive equalities in set partitions of n).
%C A078939 First column gives A078944. Row sums are given by A078945.
%F A078939 Exponential function of 4*Pascal's triangle (taken as a lower triangular matrix) divided by e^4: [A078939] = (1/e^4)*exp(4*[A007318]) = [A056857]^4.
%e A078939 Rows: {1}, {4,1}, {20,8,1}, {116,60,12,1}, {756,464,120,16,1}, ...
%Y A078939 Cf. A056857, A078937, A078938, A078944, A078945.
%K A078939 nonn,tabl
%O A078939 0,2
%A A078939 _Paul D. Hanna_, Dec 18 2002