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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). [From Reinhard Zumkeller, Mar 08 2010]

Row sums are n^3+(n+1)^3 [A005898](1,9,35,91,189,...,) [From 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 [From Reinhard Zumkeller, Mar 08 2010]

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 * A158441 A102787 A014193

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 November 27 17:39 EST 2014. Contains 250249 sequences.