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 A133311 The nonnegative integers reordered in groups of 5 even numbers followed by 5 odd numbers. 0
 0, 2, 4, 6, 8, 1, 3, 5, 7, 9, 10, 12, 14, 16, 18, 11, 13, 15, 17, 19, 20, 22, 24, 26, 28, 21, 23, 25, 27, 29, 30, 32, 34, 36, 38, 31, 33, 35, 37, 39, 40, 42, 44, 46, 48, 41, 43, 45, 47, 49, 50, 52, 54, 56, 58, 51, 53, 55, 57, 59, 60, 62, 64, 66, 68, 61, 63, 65, 67, 69, 70, 72, 74 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1). FORMULA a(n)= g*10+2*r-9*floor(r/5), where g=floor(n/10) and r=n mod 10. a(n)= a(n-10)+10. O.g.f.: x(2+2x+2x^2+2x^3-7x^4+2x^5+2x^6+2x^7+2x^8+x^9)/( (-1+x)^2 (1+x)(x^4+x^3+x^2+x+1)(x^4-x^3+x^2-x+1)). - R. J. Mathar, Jul 22 2008 MATHEMATICA LinearRecurrence[{1, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1}, {0, 2, 4, 6, 8, 1, 3, 5, 7, 9, 10}, 80] (* Harvey P. Dale, Jan 09 2017 *) CROSSREFS Cf. A001477. Sequence in context: A169909 A180592 A004092 * A088402 A077492 A007396 Adjacent sequences:  A133308 A133309 A133310 * A133312 A133313 A133314 KEYWORD nonn,easy AUTHOR Paul Curtz, Oct 18 2007 EXTENSIONS Edited by R. J. Mathar, Jul 22 2008 STATUS approved

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Last modified April 16 04:49 EDT 2021. Contains 343030 sequences. (Running on oeis4.)