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 A213964 #6 Jul 22 2025 23:05:16 %S A213964 5314,1299735,74323976,1839121115,26346319032,256652587891, %T A213964 1876235252048,10982618599248,53844488576650,228411366730514, %U A213964 858979624713168,2917594805354242,9082065855050720,26213547883869330,70820298142121408 %N A213964 Number of 4X4 0..n matrices with row and column 1..4 having sum <= i*n. %C A213964 Row 4 of A213962 %H A213964 R. H. Hardin, <a href="/A213964/b213964.txt">Table of n, a(n) for n = 1..41</a> %F A213964 Empirical: a(n) = (4679471/2270268000)*n^16 + (135958687/2476656000)*n^15 + (2078860429/3113510400)*n^14 + (2558219003/518918400)*n^13 + (274698527/11088000)*n^12 + (481269659/5346000)*n^11 + (18685736999/76204800)*n^10 + (19501561159/38102400)*n^9 + (22571956991/27216000)*n^8 + (1057766063/1008000)*n^7 + (82705488571/79833600)*n^6 + (1231373209/1555200)*n^5 + (3137244260567/6810804000)*n^4 + (299434637471/1513512000)*n^3 + (51361787/864864)*n^2 + (268615/24024)*n + 1 %e A213964 Some solutions for n=4 %e A213964 ..3..0..1..0....1..3..0..0....3..0..0..0....1..3..0..0....4..0..0..0 %e A213964 ..1..2..0..3....0..4..2..1....0..4..3..0....3..4..0..0....0..4..0..4 %e A213964 ..0..3..1..2....0..1..0..1....0..3..1..4....0..1..3..3....0..1..2..4 %e A213964 ..0..2..1..0....1..0..4..0....0..0..0..4....0..0..4..4....0..1..2..4 %K A213964 nonn %O A213964 1,1 %A A213964 _R. H. Hardin_ Jun 28 2012