A161985 Table read by rows: the number 2n+1 followed by the numbers n+1 to 3n+1.

1, 1, 3, 2, 3, 4, 5, 3, 4, 5, 6, 7, 7, 4, 5, 6, 7, 8, 9, 10, 9, 5, 6, 7, 8, 9, 10, 11, 12, 13, 11, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 13, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 15, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 16, 9, 10, 11, 12, 13, 14, 15, 16, 17

Offset

0,3

Comments

Row sums are 2(n+1)(2n+1). Row sums discarding the first column are (2n+1)^2,

that is the square of the element in the first column.

Links

Table of n, a(n) for n=0..81.

Example

The table with rows starting at n=0 is
1,1;
3,2,3,4;
5,3,4,5,6,7;
7,4,5,6,7,8,9,10;
9,5,6,7,8,9,10,11,12,13;

Crossrefs

Sequence in context: A055923 A035634 A091563 * A292787 A335944 A035366

Adjacent sequences: A161982 A161983 A161984 * A161986 A161987 A161988

Keyword

nonn,tabf,less

Author

Juri-Stepan Gerasimov, Jun 23 2009

Extensions

Edited by R. J. Mathar, Jun 28 2009

Status

approved