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Inverse permutation to A057028.
2

%I #10 Jan 15 2013 03:38:53

%S 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,

%T 25,27,36,34,32,30,29,31,33,35,45,43,41,39,37,38,40,42,44,55,53,51,49,

%U 47,46,48,50,52,54,66,64,62,60,58,56,57,59,61,63,65,78,76,74,72,70,68

%N Inverse permutation to A057028.

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%e If viewed as a regular triangle:

%e 1;

%e 3, 2;

%e 6, 4, 5;

%e 10, 8, 7, 9;

%e 15, 13, 11, 12, 14;

%e 21, 19, 17, 16, 18, 20;

%e 28, 26, 24, 22, 23, 25, 27;

%e 36, 34, 32, 30, 29, 31, 33, 35;

%e 45, 43, 41, 39, 37, 38, 40, 42, 44;

%e 55, 53, 51, 49, 47, 46, 48, 50, 52, 54;

%e 66, 64, 62, 60, 58, 56, 57, 59, 61, 63, 65;

%e 78, 76, 74, 72, 70, 68...

%K easy,nonn

%O 1,2

%A _N. J. A. Sloane_, Oct 20 2001

%E More terms from _David Wasserman_, Aug 14 2002