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