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 A115731 Permutation of natural numbers generated by 3-rowed array shown below. 0
 1, 6, 2, 7, 5, 3, 12, 8, 4, 13, 11, 9, 18, 14, 10, 19, 17, 15, 24, 20, 16, 25, 23, 21, 30, 26, 22, 31, 29, 27, 36, 32, 28, 37, 35, 33, 42, 38, 34, 43, 41, 39, 48, 44, 40, 49, 47, 45, 54, 50, 46, 55, 53, 51, 60, 56, 52, 61, 59, 57, 66, 62, 58, 67, 65, 63, 72, 68, 64, 73, 71, 69 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 1 6 7 12 13 18 19 24 25 ... a(n)=congruent to {0, 1} mod 6, cf. A047225 2 5 8 11 14 17 20 23 26 ... a(n)= 3n+2= A016789 3 4 9 10 15 16 21 22 27 ... a(n)=congruent to {3, 4} mod 6, cf. A047230 REFERENCES M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997 LINKS Index to sequences with linear recurrences with constant coefficients, signature (2,-2,2,-2,2,-1). FORMULA Starting with the term a(3), a(n+6k) = a(n) + 6k, with k>=1. CROSSREFS Cf. A115302. Sequence in context: A048595 A153313 A096050 * A163340 A021090 A177889 Adjacent sequences:  A115728 A115729 A115730 * A115732 A115733 A115734 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Mar 19 2006 STATUS approved

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