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 A113174 #6 Mar 31 2012 13:21:29
%S A113174 1,3,11,44,184,792,3484,15592,70745,324561,1502511,7007929,32892778,
%T A113174 155221536,735915652,3503270920,16737092549,80218277681,385574074383,
%U A113174 1858059853316,8974761939239,43441619693731,210682920968681
%N A113174 Number of fixed 3D piled polyominoes: polycubes with fixed orientation, with no cubes "sitting on air".
%F A113174 a(n) = sum_{m=1}^n A001168(m)*C(n-1, m-1). If both sequences are shifted left, binomial transform of A001168.
%e A113174 For n = 4, there are 4 orientations of the angled tricube excluded: those which set it on a point; this leaves 8 orientations of the angled tricube and 3 of the straight tricube.
%Y A113174 Cf. A001168, A001931 (fixed polycubes).
%K A113174 nonn
%O A113174 1,2
%A A113174 _Franklin T. Adams-Watters_, Oct 15 2005
%E A113174 Corrected by Franklin T. Adams-Watters, Oct 25 2006