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 A052366 #9 Sep 03 2018 23:06:43 %S A052366 1,1,4,10,33,78,224,549,1403,3292,7677,16934,36581,75732,152949, %T A052366 298784,569636,1056500,1916502,3396630,5901524,10051384,16820192, %U A052366 27664756,44795247,71442327,112366941,174384376,267289440,404838044,606375995 %N A052366 Number of nonnegative integer 4 X 4 matrices with sum of elements equal to n, under row and column permutations. %H A052366 Andrew Howroyd, <a href="/A052366/b052366.txt">Table of n, a(n) for n = 0..1000</a> %F A052366 G.f.: (x^34 - 4*x^33 + 6*x^32 - x^31 + 3*x^30 - 11*x^29 + 33*x^28 - 19*x^27 + 81*x^26 - 52*x^25 + 152*x^24 - 36*x^23 + 255*x^22 - 130*x^21 + 367*x^20 - 84*x^19 + 350*x^18 - 94*x^17 + 350*x^16 - 84*x^15 + 367*x^14 - 130*x^13 + 255*x^12 - 36*x^11 + 152*x^10 - 52*x^9 + 81*x^8 - 19*x^7 + 33*x^6 - 11*x^5 + 3*x^4 - x^3 + 6*x^2 - 4*x + 1)/((x^10 + x^9 - x^7 - x^6 + x^4 + x^3 - x - 1)*(x^6 - 1)^2*(x^2 + 1)^3*(x^2 - 1)^4*(x^2 + x + 1)^2*(x + 1)*(x - 1)^9). %Y A052366 Row 4 of A318795. %Y A052366 Cf. A002724, A053307, A052365. %K A052366 nonn %O A052366 0,3 %A A052366 _Vladeta Jovovic_, Mar 08 2000