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 A056378 #7 Aug 22 2017 20:53:10 %S A056378 0,0,0,12,60,792,1404,10716,31200,205032,349956,3727932,5065804, %T A056378 41574312,127199028,517290132,1041517620,11195637720,15012935676, %U A056378 135825699612,363040469732,1746670165416,3181465294092 %N A056378 Number of step shifted (decimated) sequences using exactly four different symbols. %C A056378 See A056371 for an explanation of step shifts. %D A056378 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 A056378 A056373(n)-4*A056372(n)+6*A056371(n)-4. %Y A056378 Cf. A056373. %K A056378 nonn %O A056378 1,4 %A A056378 _Marks R. Nester_