OFFSET
1,2
COMMENTS
FORMULA
EXAMPLE
First few rows of the triangle are:
1;
3, 5;
6, 8, 11;
10, 12, 15, 19;
15, 17, 20, 24, 29;
21, 23, 26, 30, 35, 41;
28, 30, 33, 37, 42, 48, 55;
...
MAPLE
T:=proc(n, k) options operator, arrow: (1/2)*n*(n+1)+(1/2)*k*(k+1)-1 end proc: for n to 10 do seq(T(n, k), k=1..n) end do; # yields sequence in triangular form - Emeric Deutsch, Sep 06 2008
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jul 10 2007
STATUS
approved