OFFSET

1,3

EXAMPLE

The array begins:

(1) 1 1 1 1 1 1 1...

(2 3) 4 5 6 7 8 9...

(3 5 8) 12 17 23 30 38...

(4 7 12 20)32 49 72 102...

(5 9 16 28 48)80 129 201...,

each term being the sum of the number to its left and the number to its top right. Terms in parentheses are given in sequence A053218, the rest included in this sequence.

CROSSREFS

KEYWORD

nonn,tabl

AUTHOR

Jonathan R. Love (japanada11(AT)yahoo.ca), Nov 20 2007

STATUS

approved