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

Author

Mokhtar Mohamed, Jun 25 2020

Keywords

• nonn
• tabl
• easy

Examples

			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
		

Crossrefs

Cf. A257238.

Programs

Mathematica

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