

A082019


Diagonal of square array T(n,k) with T(1,1) = 1 where antidiagonals are filled alternating upwards and downwards with the smallest number not already used such that the nth antidiagonal sum is a multiple of n.


3



1, 5, 12, 25, 41, 60, 85, 112, 145, 180, 221, 264, 313, 365, 420, 481, 544, 613, 684, 761, 840, 925, 1012, 1105, 1200, 1301, 1404, 1513, 1624, 1741, 1860, 1985, 2112, 2245, 2380, 2521, 2664, 2813, 2964, 3121, 3281, 3444, 3613, 3784, 3961, 4140, 4325, 4512
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..48.


EXAMPLE

T(n,k) begins:
1, 2, 7, 6, 18, 15, ...
4, 5, 8, 14, 16, 27, ...
3, 9, 12, 17, 26, 31, ...
13, 11, 19, 25, 32, 42, ...
10, 20, 24, 33, 41, 50, ...
21, 23, 34, 39, 51, 60, ...


CROSSREFS

Cf. A074135, A082017, A082018, A082002, A082003, A082004, A082005.
Sequence in context: A109624 A081501 A274629 * A336877 A212058 A303854
Adjacent sequences: A082016 A082017 A082018 * A082020 A082021 A082022


KEYWORD

nonn


AUTHOR

Amarnath Murthy, Apr 05 2003


EXTENSIONS

Edited and more terms from Alois P. Heinz, Oct 26 2011


STATUS

approved



