OFFSET
1,1
FORMULA
a(n) = 2*A210983(n).
EXAMPLE
Example 1: written as a triangle in which row i is related to the (i-1)st level of nucleus the sequence begins:
2;
6, 8;
14, 16, 20;
28, 32, 34, 40;
50, 56, 58, 62, 70;
82, 90, 94, 96, 102, 112;
126, 136, 142, 144, 148, 156, 168;
184, 196, 204, 208, 210, 216, 226, 240;
258, 272, 282, 288, 290, 294, 302, 314, 330;
350, 366, 378, 386, 390, 392, 398, 408, 422, 440;
...
Example 2: written as an irregular triangle in which row j is related to the j-th shell of nucleus. In this case note that row 4 has only one term. Triangle begins:
2;
6, 8;
14, 16, 20;
28;
32, 34, 40; 50;
56, 58, 62, 70; 82;
90, 94, 96, 102, 112; 126;
136, 142, 144, 148, 156, 168; 184;
196, 204, 208, 210, 216, 226, 240; 258;
272, 282, 288, 290, 294, 302, 314, 330, 350;
366, 378, 386, 390, 392, 398, 408, 422, 440, 462;
...
First seven terms of right border give the "magic numbers" A018226.
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Omar E. Pol, Jul 14 2012
STATUS
approved