OFFSET
0,4
EXAMPLE
...1....1....1....1....1....2....1....1....2....3....1.
...1....2....3....3....5....7....5....7...11...15....7.
...2....5....7...11...15...22...22...30...42...56...42.
...3...11...15...30...42...56...77..101..135..176..176.
...5...22...30...77..101..135..231..297..385..490..627.
...7...42...56..176..231..297..627..792.1002.1255.1958.
CROSSREFS
KEYWORD
AUTHOR
Omar E. Pol, Dec 06 2010
STATUS
approved