OFFSET
1,2
COMMENTS
Question: Is there some connection with fractals?
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..4000
Omar E. Pol, Illustration of the seven regions of 5
FORMULA
EXAMPLE
For n = 6 the largest parts of the first six regions of the shell model of partitions are 1, 2, 3, 2, 4, 3, so a(6) = 1+2+3+2+4+3 = 15.
Written as a triangle begins:
1;
3;
6;
8, 12;
15, 20;
22, 26, 29, 35;
38, 43, 47, 54;
56, 60, 63, 69, 74, 78, 86;
89, 94, 98,105,108,114,119,128;
130,134,137,143,148,152,160,164,171,177,182,192;
195,200,204,211,214,220,225,234,239,243,251,258,264,275;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Jan 25 2011
EXTENSIONS
New name from Omar E. Pol, Apr 26 2012
STATUS
approved