A116468 Permutation of natural numbers generated by 2-rowed array shown below.

2, 3, 1, 6, 4, 7, 5, 10, 8, 11, 9, 14, 12, 15, 13, 18, 16, 19, 17, 22, 20, 23, 21, 26, 24, 27, 25, 30, 28, 31, 29, 34, 32, 35, 33, 38, 36, 39, 37, 42, 40, 43, 41, 46, 44, 47, 45, 50, 48, 51, 49, 54, 52, 55, 53, 58, 56, 59, 57, 62, 60, 63, 61, 66, 64, 67

Offset

1,1

Comments

2 3 6 7 10 11 14 15 ... integers congruent to 2 or 3 mod 4

1 4 5 8 9 12 13 16 ... integers congruent to 0 or 1 mod 4

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

Table of n, a(n) for n=1..66.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,1,-1).

Formula

For n>2, a(n+4k) = a(n) + 4k, with k>=1.

G.f.: x*(2+x-2*x^2+5*x^3-4*x^4+2*x^5)/(1-x-x^4+x^5). - Philippe Deléham, Dec 02 2016

Crossrefs

Cf. A090964.

Sequence in context: A223486 A205112 A173161 * A110237 A189970 A076631

Adjacent sequences: A116465 A116466 A116467 * A116469 A116470 A116471

Keyword

easy,nonn

Author

Giovanni Teofilatto, Mar 17 2006

Extensions

Terms corrected by R. J. Mathar, Oct 25 2011

Status

approved