|
|
A132118
|
|
Triangle read by rows: T(n,k) = n*(n-1)/2 + 2*k - 1.
|
|
2
|
|
|
1, 2, 4, 4, 6, 8, 7, 9, 11, 13, 11, 13, 15, 17, 19, 16, 18, 20, 22, 24, 26, 22, 24, 26, 28, 30, 32, 34, 29, 31, 33, 35, 37, 39, 41, 43, 37, 39, 41, 43, 45, 47, 49, 51, 53, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
EXAMPLE
|
First few rows of the triangle are:
1;
2, 4;
4, 6, 8;
7, 9, 11, 13;
11, 13, 15, 17, 19;
16, 18, 20, 22, 24, 26;
22, 24, 26, 28, 30, 32, 34;
29, 31, 33, 35, 37, 39, 41, 43;
...
|
|
MATHEMATICA
|
Table[(n(n-1))/2+2k-1, {n, 20}, {k, n}]//Flatten (* Harvey P. Dale, Mar 26 2022 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Name changed and terms a(56) and beyond from Andrew Howroyd, Apr 17 2021
|
|
STATUS
|
approved
|
|
|
|