A132379 - OEIS

A132379

Array read by columns down to the main diagonal where the first element in row n is n and element k+1 in row n is the sum of element k in row n and element k-1 in row n-1.

1, 1, 4, 1, 5, 12, 1, 6, 17, 1, 7, 23, 49, 80, 1, 8, 30, 72, 129, 192, 1, 9, 38, 102, 201, 321, 448, 1, 10, 47, 140, 303, 522, 769, 1024, 1, 11, 57, 187, 443, 825, 1291, 1785, 2304, 1, 12, 68, 244, 630, 1268, 2116, 3076, 4089, 5120

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..54.

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

Cf. A053218.

Sequence in context: A090842 A120868 A100279 * A193955 A130746 A342925

Adjacent sequences: A132376 A132377 A132378 * A132380 A132381 A132382

KEYWORD

nonn,tabl

AUTHOR

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

STATUS

approved