A279160 Irregular triangle read by rows in which row n lists the perimeters of the parts of the symmetric representation of sigma(n).
4, 8, 6, 6, 16, 8, 8, 24, 10, 10, 32, 12, 8, 12, 20, 20, 14, 14, 48, 16, 16, 26, 26, 18, 16, 18, 64
Offset: 1
Examples
4; 8; 6, 6; 16; 8, 8; 24; 10, 10; 32; 12, 8, 12; 20, 20; 14, 14; 48; 16, 16; 26, 26; 18, 16, 18; 64; ... Illustration of the 9th row: . 12 . _ _ _ _ _ . |_ _ _ _ _| . _ _ 8 . |_ | . |_| _ . | | . | | . | | 12 . | | . |_| . For n = 9 the symmetric representation of sigma(9) = 13 has three parts of areas 5, 3, 5 respectively. The perímeters of the parts are 12, 8 and 12 as shown above, so the 9th row of triangle is 12, 8, 12.