A335821 Triangular array T(n, k) = n^2 - k^2, read by rows.

0, 1, 0, 4, 3, 0, 9, 8, 5, 0, 16, 15, 12, 7, 0, 25, 24, 21, 16, 9, 0, 36, 35, 32, 27, 20, 11, 0, 49, 48, 45, 40, 33, 24, 13, 0, 64, 63, 60, 55, 48, 39, 28, 15, 0, 81, 80, 77, 72, 65, 56, 45, 32, 17, 0, 100, 99, 96, 91, 84, 75, 64, 51, 36, 19, 0, 121, 120, 117, 112, 105, 96, 85, 72, 57, 40, 21, 0

Offset

0,4

Links

Table of n, a(n) for n=0..77.

Example

The triangle begins:
n\k     0      1       2      3      4      5      6     7      8      9
0       0
1       1      0
2       4      3       0
3       9      8       5      0
4      16     15      12      7      0
5      25     24      21     16      9      0
6      36     35      32     27     20     11      0
7      49     48      45     40     33     24     13      0
8      64     63      60     55     48     39     28     15      0
9      81     80      77     72     65     56     45     32     17     0

Mathematica

Table[(n^2 - k^2), {n, 0, 11}, {k, 0, n}] // Flatten (* Michael De Vlieger, Jun 28 2020 *)

Crossrefs

Sequence in context: A276576 A176214 A011091 * A354464 A136160 A268439

Adjacent sequences: A335818 A335819 A335820 * A335822 A335823 A335824

Keyword

nonn,tabl

Author

Mokhtar Mohamed, Jun 25 2020

Status

approved