Search: id:A052366
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%I A052366
%S A052366 1,1,4,10,33,78,224,549,1403,3292,7677,16934,36581,75732,152949,298784,
%T A052366 569636,1056500,1916502,3396630,5901524,10051384,16820192,27664756,
%U A052366 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.
%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 Cf. A002724, A053307, A052365.
%Y A052366 Sequence in context: A110145 A162427 A165730 this_sequence A052367 A052372 
               A052373
%Y A052366 Adjacent sequences: A052363 A052364 A052365 this_sequence A052367 A052368 
               A052369
%K A052366 nonn
%O A052366 0,3
%A A052366 Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 08 2000

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