

A064789


Inverse permutation to A057028.


2



1, 3, 2, 6, 4, 5, 10, 8, 7, 9, 15, 13, 11, 12, 14, 21, 19, 17, 16, 18, 20, 28, 26, 24, 22, 23, 25, 27, 36, 34, 32, 30, 29, 31, 33, 35, 45, 43, 41, 39, 37, 38, 40, 42, 44, 55, 53, 51, 49, 47, 46, 48, 50, 52, 54, 66, 64, 62, 60, 58, 56, 57, 59, 61, 63, 65, 78, 76, 74, 72, 70, 68
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..72.
Index entries for sequences that are permutations of the natural numbers


EXAMPLE

If viewed as a regular triangle:
1;
3, 2;
6, 4, 5;
10, 8, 7, 9;
15, 13, 11, 12, 14;
21, 19, 17, 16, 18, 20;
28, 26, 24, 22, 23, 25, 27;
36, 34, 32, 30, 29, 31, 33, 35;
45, 43, 41, 39, 37, 38, 40, 42, 44;
55, 53, 51, 49, 47, 46, 48, 50, 52, 54;
66, 64, 62, 60, 58, 56, 57, 59, 61, 63, 65;
78, 76, 74, 72, 70, 68...


CROSSREFS

Sequence in context: A191429 A191655 A120911 * A195111 A274315 A194059
Adjacent sequences: A064786 A064787 A064788 * A064790 A064791 A064792


KEYWORD

easy,nonn


AUTHOR

N. J. A. Sloane, Oct 20 2001


EXTENSIONS

More terms from David Wasserman, Aug 14 2002


STATUS

approved



