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 A110032 A characteristic triangle for the Euler totient function (A000010). 0
 1, -1, 1, 1, -3, 1, 0, 5, -7, 1, -4, 22, 23, -13, 1, -64, 20, 172, 29, -19, 1, -240, -1120, -496, 354, 111, -29, 1, 2656, 1760, -4952, -1816, 1054, 239, -41, 1, 15360, 24800, -28640, -29040, 2384, 3938, 203, -49, 1, 88064, 587136, 601216, -63776, -191224, -21360, 6658, 511, -65, 1, -1714176, -4244224, 4907392 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS Form the n X n Hankel matrices phi(i-j+1), 1<=i,j<=n for the Euler totient function and take characteristic polynomials. Triangle rows give coefficients of the characteristic polynomials of these matrices. (Construction described by Michael Somos in A064831). First column is a signed version of Hankel transform of Euler totient function, A056229. LINKS EXAMPLE Rows begin 1; -1,1; 1,-3,1; 0,5,-7,1; -4,22,23,-13,1; -64,20,172,29,-19,1; -240,-1120,-496,354,111,-29,1; CROSSREFS Sequence in context: A121440 A011084 A021326 * A201667 A175779 A135670 Adjacent sequences:  A110029 A110030 A110031 * A110033 A110034 A110035 KEYWORD sign,tabl AUTHOR Paul Barry, Jul 08 2005 STATUS approved

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Last modified June 19 19:50 EDT 2013. Contains 226416 sequences.