OFFSET
1,1
FORMULA
a(n) = A279160(n)/2.
EXAMPLE
Triangle begins:
2;
4;
3, 3;
8;
4, 4;
12;
5, 5;
16;
6, 4, 6;
10, 10;
7, 7;
24;
8, 8;
13, 13;
9, 8, 9;
32;
...
For n = 9 the symmetric representation of sigma(9) = 13 has three parts of areas 5, 3, 5 respectively. The perĂmeters of the parts are 12, 8 and 12, so the 9th row of triangle lists the semiperimeters: 6, 4, 6.
CROSSREFS
KEYWORD
nonn,tabf,more
AUTHOR
Omar E. Pol, Dec 07 2016
STATUS
approved