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 A130496 #21 Jan 29 2025 16:52:17 %S A130496 0,0,0,0,0,2,2,2,2,2,4,4,4,4,4,6,6,6,6,6,8,8,8,8,8,10,10,10,10,10,12, %T A130496 12,12,12,12,14,14,14,14,14,16,16,16,16,16,18,18,18,18,18,20,20,20,20, %U A130496 20,22,22,22,22,22,24,24,24,24,24,26,26,26,26,26,28,28,28,28,28,30,30,30 %N A130496 Repetition of even numbers five times. %F A130496 a(n) = 2*floor(n/5). %p A130496 P:=proc(q) local k,n; k:=[]; for n from 0 to q do k:=[op(k),2*floor(n/5)];od; op(k); end: P(77); %t A130496 Table[#,5]&/@(2*Range[0,15])//Flatten (* _Harvey P. Dale_, Sep 11 2016 *) %Y A130496 Cf. A122461. %K A130496 easy,nonn %O A130496 0,6 %A A130496 _Paolo P. Lava_ and _Giorgio Balzarotti_, May 31 2007