OFFSET
1,2
COMMENTS
The third diagonal is the generalized pentagonal sequence A001318
EXAMPLE
Consider
1.......1.......6.......6.......21......21....
........1.......1.......6.......6.......21....
................1.......1.......6.......6.....
which sums to
1.....2....8.....13....33....48....,
a diagonal of A124458
CROSSREFS
KEYWORD
AUTHOR
Alford Arnold, Nov 04 2006
STATUS
approved