OFFSET
1,1
COMMENTS
All terms are multiples of 4.
Row length L = Ceiling(n/2 - 1), thus the smallest value of n in A120070 to produce even terms is n = 3. - Michael De Vlieger, Apr 14 2016
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
EXAMPLE
Irregular triangle:
n Even values of A120070(n)
3 8
4 12
5 24 16
6 32 20
7 48 40 24
8 60 48 28
9 80 72 56 32
10 96 84 64 36
11 120 112 96 72 40
12 140 128 108 80 44
...
MATHEMATICA
Table[n^2 - k^2, {n, 3, 18}, {k, n}] /. m_ /; Or[OddQ@ m, m == 0] -> Nothing // Flatten (* Michael De Vlieger, Apr 14 2016, after Alonso del Arte at A120070 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Paul Curtz, Aug 23 2008
EXTENSIONS
More terms from Michael De Vlieger, Apr 14 2016
STATUS
approved