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 A026476 For n>3, a(n) = 7*n - 21 + 2*(-1)^n. 3
 1, 3, 4, 9, 12, 23, 26, 37, 40, 51, 54, 65, 68, 79, 82, 93, 96, 107, 110, 121, 124, 135, 138, 149, 152, 163, 166, 177, 180, 191, 194, 205, 208, 219, 222, 233, 236, 247, 250, 261, 264, 275, 278, 289, 292, 303, 306, 317, 320, 331, 334, 345, 348, 359, 362, 373, 376 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The old definition of this sequence was "a(n) = least positive integer > a(n-1) and not equal to a(i)+a(j)+a(k) for 1<=i<=j<=k<=n". However, Ralf Stephan observes that this does not fit the terms shown. (It produces A109474.) The present definition (due to Stephan) has been adopted as a temporary solution. It would be nice to have a definition similar to the original one. - N. J. A. Sloane, Nov 24 2004 LINKS Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1). FORMULA a(n) = a(n-1)+a(n-2)-a(n-3) for n>6. G.f.: x*(1+2*x+3*x^3+2*x^4+6*x^5)/((1-x)^2*(1+x)). [Colin Barker, May 02 2012] CROSSREFS Cf. A026472, A026474, A109474. Sequence in context: A105137 A025613 A097063 * A002513 A034418 A034421 Adjacent sequences:  A026473 A026474 A026475 * A026477 A026478 A026479 KEYWORD nonn,easy AUTHOR EXTENSIONS More terms from David Duran (dduran(AT)ashland.edu), Dec 14 2005 STATUS approved

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