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 A058002 Number of 4 X 4 matrices with entries mod n, up to row and column permutation. 4
 1, 317, 90492, 7880456, 270656150, 4947097821, 58002778967, 490172624992, 3223155968811, 17382581357725, 79840867013666, 321169288917192, 1155731257886192, 3782368364610941, 11406226119319725, 32031530635953536, 84493500676300117, 210856844364222717 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Number of k X l matrices with entries mod n, up to row and column permutation is Z(S_k X S_l; n,n,...) where Z(S_k X S_l; x_1,x_2,...) is cycle index of Cartesian product of symmetric groups S_k and S_l of degree k and l, respectively. LINKS Alois P. Heinz, Table of n, a(n) for n = 1..1000 FORMULA a(n)=(1/4!^2)*(n^16 + 12*n^12 + 36*n^10 + 67*n^8 + 160*n^6 + 204*n^4 + 96*n^2). G.f.: -x*(x +1)*(x^14 +299*x^13 +84940*x^12 +6299584*x^11 +142482546*x^10 +1214416453*x^9 +4351647617*x^8 +6732281120*x^7 +4351647617*x^6 +1214416453*x^5 +142482546*x^4 +6299584*x^3 +84940*x^2 +299*x +1) / (x -1)^17. - Colin Barker, Jul 09 2013 CROSSREFS Cf. A058001, A058003, A058004, A002724, A052271, A052272. Row n=4 of A246106. Sequence in context: A273804 A142130 A278279 * A252246 A252254 A252247 Adjacent sequences: A057999 A058000 A058001 * A058003 A058004 A058005 KEYWORD easy,nonn AUTHOR Vladeta Jovovic, Nov 04 2000 EXTENSIONS More terms from Colin Barker, Jul 09 2013 STATUS approved

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Last modified March 4 05:23 EST 2024. Contains 370522 sequences. (Running on oeis4.)