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 A052366 Number of nonnegative integer 4 X 4 matrices with sum of elements equal to n, under row and column permutations. 6
 1, 1, 4, 10, 33, 78, 224, 549, 1403, 3292, 7677, 16934, 36581, 75732, 152949, 298784, 569636, 1056500, 1916502, 3396630, 5901524, 10051384, 16820192, 27664756, 44795247, 71442327, 112366941, 174384376, 267289440, 404838044, 606375995 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Andrew Howroyd, Table of n, a(n) for n = 0..1000 FORMULA 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). CROSSREFS Row 4 of A318795. Cf. A002724, A053307, A052365. Sequence in context: A179654 A162427 A165730 * A309682 A318563 A052367 Adjacent sequences:  A052363 A052364 A052365 * A052367 A052368 A052369 KEYWORD nonn AUTHOR Vladeta Jovovic, Mar 08 2000 STATUS approved

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Last modified September 20 04:35 EDT 2020. Contains 337264 sequences. (Running on oeis4.)