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 A018236 #10 Jul 08 2025 06:33:03 %S A018236 1,0,0,0,249849,18106704,462962955,4397342400,16602715899,25756721120, %T A018236 16602715899,4397342400,462962955,18106704,249849,0,0,0,1 %N A018236 Weight distribution of hypothetical [ 72,36,16 ] doubly-even binary self-dual code. %D A018236 N. J. A. Sloane, Is There a (72,36) d = 16 Self-Dual Code?, IEEE Trans. Information Theory, vol. IT-19 (1973), p. 251. %H A018236 E. M. Rains and N. J. A. Sloane, Self-dual codes, pp. 177-294 of Handbook of Coding Theory, Elsevier, 1998 (<a href="http://neilsloane.com/doc/self.txt">Abstract</a>, <a href="http://neilsloane.com/doc/self.pdf">pdf</a>, <a href="http://neilsloane.com/doc/self.ps">ps</a>). %F A018236 Let f = x^8 + 14 x^4 y^4 + y^8, g = x^4 y^4 (x^4-y^4)^4. Form the unique linear combination of f^9, f^6 g, f^3 g^2 and g^3 that begins x^72 + A_4 x^68 y^4 + A_8 x^64 y^8 + ..., with A_4 = A_8 = A_12 = 0, Set x=1, replace y^4 by y, and we have the g.f. for this sequence. %Y A018236 Cf. A004675, A019590, A120373. %K A018236 nonn,fini,full %O A018236 0,5 %A A018236 _N. J. A. Sloane_