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A170950 Inverse permutation to A170949. 5
1, 3, 2, 4, 7, 6, 8, 5, 9, 13, 12, 14, 11, 15, 10, 16, 21, 20, 22, 19, 23, 18, 24, 17, 25, 31, 30, 32, 29, 33, 28, 34, 27, 35, 26, 36, 43, 42, 44, 41, 45, 40, 46, 39, 47, 38, 48, 37, 49, 57, 56, 58, 55, 59, 54, 60, 53, 61, 52, 62, 51, 63, 50, 64, 73, 72, 74, 71, 75, 70, 76, 69, 77, 68, 78 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(A002522(n-1)) = A002061(n); a(A002061(n)) = A174114(n). - Reinhard Zumkeller, Mar 08 2010

Row sums are n^3+(n+1)^3 [A005898](1,9,35,91,189,...). - Vincenzo Librandi, Feb 22 2010

The even central polygonal numbers divided by 2 give the central column of the triangle. - Omar E. Pol, Aug 16 2011

REFERENCES

J. H. Conway, Personal communication, Feb 19 2010

LINKS

R. Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers [From Reinhard Zumkeller, Mar 08 2010]

EXAMPLE

                           1

                        3  2  4

                     7  6  8  5  9

                 13 12 14 11 15 10 16

              21 20 22 19 23 18 24 17 25

           31 30 32 29 33 28 34 27 35 26 36

        43 42 44 41 45 40 46 39 47 38 48 37 49

     57 56 58 55 59 54 60 53 61 52 62 51 63 50 64

  73 72 74 71 75 70 76 69 77 68 78 67 79 66 80 65 81

CROSSREFS

Sequence in context: A105025 A129594 A214416 * A276954 A276944 A300501

Adjacent sequences:  A170947 A170948 A170949 * A170951 A170952 A170953

KEYWORD

nonn,tabf

AUTHOR

N. J. A. Sloane, Feb 21 2010

STATUS

approved

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Last modified August 19 07:51 EDT 2018. Contains 313857 sequences. (Running on oeis4.)