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A370649
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Dimension of space of equivariant linear maps from R^{n^3} to R^{n^3} under diagonal action of {-1, 1}^n.
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1
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0, 1, 32, 183, 544, 1205, 2256, 3787, 5888, 8649, 12160, 16511, 21792, 28093, 35504, 44115, 54016, 65297, 78048, 92359, 108320, 126021, 145552, 167003, 190464, 216025, 243776, 273807, 306208, 341069, 378480, 418531, 461312, 506913, 555424, 606935, 661536, 719317
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = (1/2^n) * Sum_{s in {-1,1}^n} (s_1 + s_2 + ... + s_n)^6 [from Proposition 7 of Lim et al.]. - Sean A. Irvine, Jul 14 2024
a(n) = 2^(-n) * Sum_{k=0..n} (2*k-n)^6 * binomial(n,k).
G.f.: x*(61*x^2+28*x+1)/(x-1)^4.
a(n) = 15*n^3 - 30*n^2 + 16*n. (End)
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MAPLE
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a:= n-> ((15*n-30)*n+16)*n:
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PROG
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(Python)
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CROSSREFS
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KEYWORD
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nonn,easy,new
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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