OFFSET
0,6
REFERENCES
Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, page 769, Fig. 12.13.
EXAMPLE
Triangle begins:
1;
1;
1, 1;
1, 2, 2, 1;
1, 2, 5, 6, 5, 3, 1;
1, 2, 5, 10, 16, 20, 20, 15, 9, 4, 1;
1, 2, 5, 10, 20, 32, 51, 67, 79, 80, 68, 49, 29, 14, 5, 1;
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
N. J. A. Sloane, Dec 25 2018
EXTENSIONS
More terms from Alois P. Heinz, Dec 27 2018
STATUS
approved