OFFSET
1,2
COMMENTS
Row sums = Bell numbers, A000110 starting (1, 2, 5, 15, 52, 203, 877,...).
FORMULA
EXAMPLE
First few rows of the triangle =
1;
2, 0;
3, 0, 2;
4, 0, 4, 7;
5, 0, 6, 14, 27;
6, 0, 8, 21, 54, 114;
7, 0, 10, 28, 81, 228, 523;
8, 0, 12, 35, 108, 342, 1046, 2589;
9, 0, 14, 42, 135, 456, 1569, 5178, 13744;
10, 0, 16, 49, 162, 570, 2092, 7767, 27488, 77821;
...
Row 5 = (5, 0, 6, 14, 27), sum = A000110(5) = 52 = termwise products of
(5, 4, 3, 2, 1) and (1, 0, 2, 7, 27).
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jan 04 2009
STATUS
approved