A064789 Inverse permutation to A057028.

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

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