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 A056399 #10 Aug 22 2017 20:53:10 %S A056399 0,0,0,0,1,9,26,299,1183,10701,24736,349241,626053,6680979,26364610, %T A056399 137247254,353304459,4826418027,8199440662,93679529503,315943737331, %U A056399 1913783074461,4382586624256,60629067776483 %N A056399 Number of step shifted (decimated) sequence structures using exactly five different symbols. %C A056399 See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure. %D A056399 M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2] %F A056399 A056394(n)-A056393(n). %Y A056399 Column 5 of A288620. %Y A056399 Cf. A056379. %K A056399 nonn %O A056399 1,6 %A A056399 _Marks R. Nester_