OFFSET
1,1
LINKS
FORMULA
a(n) = 2*A213373(n).
EXAMPLE
Written as an irregular triangle in which row j is related to the j-th shell of nucleus. Note that row 4 has only one term. Triangle begins:
2;
6, 8;
14, 16, 20;
28;
32, 38, 40, 50;
58, 64, 76, 80, 82;
90, 100, 114, 118, 124, 126;
...
First seven terms of right border give the "magic numbers" A018226.
CROSSREFS
KEYWORD
nonn,tabf,hard,more
AUTHOR
Omar E. Pol, Jul 16 2012
STATUS
approved