A166373 - OEIS

A166373

Triangle read by rows for floor(j^2 / n) with n >= 2 and 1<=j<n.

0, 0, 1, 0, 1, 2, 0, 0, 1, 3, 0, 0, 1, 2, 4, 0, 0, 1, 2, 3, 5, 0, 0, 1, 2, 3, 4, 6, 0, 0, 1, 1, 2, 4, 5, 7, 0, 0, 0, 1, 2, 3, 4, 6, 8, 0, 0, 0, 1, 2, 3, 4, 5, 7, 9, 0, 0, 0, 1, 2, 3, 4, 5, 6, 8, 10, 0, 0, 0, 1, 1, 2, 3, 4, 6, 7, 9, 11, 0, 0, 0, 1, 1, 2, 3, 4, 5, 7, 8, 10, 12, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 9

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

2,6

LINKS

Table of n, a(n) for n=2..104.

EXAMPLE

Part of the triangle from which the sequence is constructed is shown below.

.....j..1..2..3..4..5..6..7..8..9.10.11.12.13.14

...n

...2....0

...3....0..1

...4....0..1..2

...5....0..0..1..3

...6....0..0..1..2..4

...7....0..0..1..2..3..5

...8....0..0..1..2..3..4..6

...9....0..0..1..1..2..4..5..7

..10....0..0..0..1..2..3..4..6..8

..11....0..0..0..1..2..3..4..5..7..9

..12....0..0..0..1..2..3..4..5..6..8.10

..13....0..0..0..1..1..2..3..4..6..7..9.11

..14....0..0..0..1..1..2..3..4..5..7..8.10.12

..15....0..0..0..1..1..2..3..4..5..6..8..9.11.13

PROG

(PARI) T(n, j)=j^2\n \\ Charles R Greathouse IV, Jan 16 2012

CROSSREFS

A165974 is contained in this sequence.

Cf. A166381 (column sums), A166375 (row sums).

Sequence in context: A122950 A374766 A116489 * A202451 A238727 A056885

Adjacent sequences: A166370 A166371 A166372 * A166374 A166375 A166376

KEYWORD

nonn,easy,tabl

AUTHOR

Christopher Hunt Gribble, Oct 13 2009. Offset corrected Oct 18 2009.

STATUS

approved