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 A256975 #14 Oct 13 2017 21:39:09
%S A256975 1,1,2,3,6,9,15,21,32,44,64,87,122,161,217,282,372,475,613,772,978,
%T A256975 1215,1515,1860,2290,2781,3382,4068,4896,5836,6958,8228,9727,11417,
%U A256975 13393,15614,18190,21073,24391,28095,32330,37039,42391,48325
%N A256975 G.f.: (1 + x^4 + x^5 + x^6 + x^10 + x^11 + x^12 + x^16)/Product_{i=1..8} (1 - x^i).
%D A256975 J. C. P. Miller, On the enumeration of partially ordered sets of integers, pp. 109-124 of T. P. McDonough and V. C. Mavron, editors, Combinatorics: Proceedings of the Fourth British Combinatorial Conference 1973. London Mathematical Society, Lecture Note Series, Number 13, Cambridge University Press, NY, 1974. The g.f. is G_{ref}(t) as stated on page 122, although in fact this is wrong and does not match the terms shown on page 123 - there are four missing minus signs in the g.f. The correct G_{ref}(t) is in A256976.
%p A256975 (1+x^4+x^5+x^6+x^10+x^11+x^12+x^16)/mul(1-x^i, i=1..8);
%Y A256975 Cf. A256976.
%K A256975 nonn
%O A256975 0,3
%A A256975 _N. J. A. Sloane_, Apr 22 2015