OFFSET
1,2
COMMENTS
Row sums = A000567, the octagonal numbers: (1, 8, 21, 40, 65, 96,...).
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..11325 (rows 1 <= n <= 150).
FORMULA
EXAMPLE
First few rows of the triangle are:
1;
3, 5;
5, 7, 9;
7, 9, 11, 13;
9, 11, 13, 15, 17;
11, 13, 15, 17, 19, 21;
13, 15, 17, 19, 21, 23, 25;
...
MATHEMATICA
Table[2 (n + k) - 3, {n, 150}, {k, n}] // Flatten (* Michael De Vlieger, Oct 06 2017 *)
PROG
(PARI) tabl(nn) = {ma = matrix(nn, nn, n, k, (k<=n)); mb = matrix(nn, nn, n, k, (2*n - 1)*(k==n)); mr = ma*mb + mb*ma - ma; for (n = 1, nn, for (k = 1, n, print1(mr[n, k], ", "); ); print(); ); } \\ Michel Marcus, Mar 04 2014
CROSSREFS
KEYWORD
AUTHOR
Gary W. Adamson, Jul 10 2007
EXTENSIONS
Corrected and extended by Michel Marcus, Mar 04 2014
New name from Andrey Zabolotskiy, Oct 06 2017
STATUS
approved