OFFSET
1,2
FORMULA
a(n) = A109921(n+2), n >= 3.
EXAMPLE
-----------------------------------------
. Array from
n A000027 a(n)
-----------------------------------------
1 1; 1
2 2, 3; 5
3 4; 4
4 5; 5
5 6; 6
6 7; 7
7 8, 9, 10; 27
8 11; 11
9 12; 12
10 13; 13
11 14, 15, 16; 45
12 17; 17
13 18; 18
14 19; 19
15 20, 21, 22; 63
16 23; 23
17 24, 25, 26, 27, 28; 130
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Aug 11 2012
STATUS
approved