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 A210451 #15 Feb 04 2013 16:32:18 %S A210451 0,0,0,0,3,0,5,0,7,7,9,0,11,11,13,0,15,15,17,15,19,20,0,22,22,24,22, %T A210451 26,26,28,0,30,30,32,30,34,35,30,37,37,39,40,0,42,42,44,42,46,46,48, %U A210451 42,50,51,50,53,54,0,56,56,58,56,60,61,56,63,63,65,66,56,68,68,70,68,72,72,74,75,0 %N A210451 n minus the number of parts in the n-th region of the set of partitions of j, if 1<=n<=A000041(j), with a(0) = 0. %C A210451 a(0) = 0 iff n is a partition number A000041, n >= 1. %C A210451 a(n) is also the number of zeros in the n-th row of triangle A186114 and also of triangle A193870, n >= 1. %C A210451 a(n) is also the value of the index "i" mentioned in the definition of "regions of the set of partitions" in A206437. %F A210451 a(n) = n - A194446(n) = n - A141285(n) + A194447(n). %F A210451 a(n+1) = a(n+2) = n, if a(n) = 0 and n >= 7. %Y A210451 Cf. A135010, A141285, A194446, A186114, A193870, A194447, A206437. %K A210451 nonn %O A210451 0,5 %A A210451 _Omar E. Pol_, Jan 27 2013