|
| |
|
|
A115659
|
|
Permutation of natural numbers generated by 2-rowed array shown below.
|
|
0
| |
|
|
0, 3, 1, 4, 2, 7, 5, 8, 6, 11, 9, 12, 10, 15, 13, 16, 14, 19, 17, 20, 18, 23, 21, 24, 22, 27, 25, 28, 26, 31, 29, 32, 30, 35, 33, 36, 34, 39, 37, 40, 38, 43, 41, 44, 42, 47, 45, 48, 46, 51, 49, 52, 50, 55, 53, 56, 54, 59, 57, 60, 58, 63, 61, 64, 62
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| 0 3 4 7 8 11 12 15 ...a(n)=Congruent to 0 or 3 mod 4.
1 2 5 6 9 10 13 14 ...a(n)=Congruent to 1 or 2 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
| Index to sequences with linear recurrences with constant coefficients, signature (1,0,0,1,-1).
|
|
|
FORMULA
| For n>0, a(n+4k) = a(n) + 4k, with k>=0.
|
|
|
CROSSREFS
| Cf. A090964.
Sequence in context: A139432 A202154 A115208 * A067060 A068028 A163359
Adjacent sequences: A115656 A115657 A115658 * A115660 A115661 A115662
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Mar 18 2006
|
|
|
EXTENSIONS
| Entries corrected by R. J. Mathar, Oct 25 2011
|
| |
|
|
