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 A194451 #15 Dec 01 2013 13:36:34 %S A194451 1,1,2,2,3,3,5,4,7,5,11,6,15,7,22,8,30,9,42,10,56,11,77,12,101,13,135, %T A194451 14,176,15,231,16,297,17,385,18,490,19,627,20,792,21,1002,22,1255,23, %U A194451 1575,24,1958,25,2436,26,3010,27,3718,28,4565,29,5604,30 %N A194451 Partition numbers of positive integers and positive integers interleaved. %C A194451 First differences of A194450. The length of the edges in a rectangular spiral whose vertices are the numbers A194450. The spiral contains exactly between its edges the successive last sections of the partitions of the natural numbers. For more information see A135010 and A138121. %F A194451 a(2n-1) = p(n), a(2n) = n. %F A194451 a(2n-1) = A000041(n), a(2n) = A000027(n). %F A194451 a(2n-1) + a(2n) = A133041(n). %F A194451 a(2n-1) - a(2n) = A000094(n+1). %F A194451 a(2n-1) * a(2n) = A066186(n). %Y A194451 Cf. A000041, A194450. %K A194451 nonn %O A194451 1,3 %A A194451 _Omar E. Pol_, Nov 01 2011