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 A007162 M1766 #18 Jul 08 2025 17:02:10
%S A007162 1,1,2,7,24,96,388,1667,7278,32726,149232,692014,3244182,15374906,
%T A007162 73474008,353835147,1714967402,8360511370,40964207460,201630767026,
%U A007162 996494168808,4943036743112,24601517883704,122815436413582,614828204108840
%N A007162 Number of skeins with vertical symmetry.
%D A007162 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A007162 R. C. Read, <a href="http://dx.doi.org/10.1007/BF02188172">On the enumeration of a class of plane multigraphs</a>, Aequat. Math. 31 (1986) no 1, 47-63.
%F A007162 a(n) = coefficient of x^(2n+1) in x + H(x) * C(x) where H(x) = Sum_{k=1..infinity} A007165(k) * x^(2k) and C(x) = Sum_{k=0..infinity} A007161(k) * x^(2k+1). - _Sean A. Irvine_, Nov 06 2017
%Y A007162 Cf. A007161, A007165.
%K A007162 nonn
%O A007162 0,3
%A A007162 _N. J. A. Sloane_
%E A007162 More terms from _Sean A. Irvine_, Nov 06 2017