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 A178294 Number of collinear point triples in a 4 X 4 X 4 X... n-dimensional cubic grid 1
 0, 4, 44, 376, 2960, 22624, 171584, 1303936, 9969920, 76793344 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (18, -104, 192) conjectured. FORMULA Conjecture: a(n) = 8^n/2-3*4^n/2+6^n. a(n)= +18*a(n-1) -104*a(n-2) +192*a(n-3). G.f.: 4*x*(-1+7*x)/((6*x-1)*(8*x-1)*(4*x-1)). [R. J. Mathar, May 24 2010] CROSSREFS Cf. A005059. Sequence in context: A259989 A030987 A297384 * A043039 A198962 A002754 Adjacent sequences:  A178291 A178292 A178293 * A178295 A178296 A178297 KEYWORD nonn AUTHOR R. H. Hardin, suggested by R. J. Mathar in the Sequence Fans Mailing List, May 24 2010 STATUS approved

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Last modified December 18 23:46 EST 2018. Contains 318245 sequences. (Running on oeis4.)