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A188023 Triangle by rows, A115361 * A127648 0
1, 1, 2, 0, 0, 3, 1, 2, 0, 4, 0, 0, 0, 0, 5, 0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 0, 7, 1, 2, 0, 4, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 5, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 12 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

row sums = A129527: (1, 3 3, 7, 5, 9, 7, 15,...)

LINKS

Table of n, a(n) for n=1..78.

FORMULA

Let A = the ruler function triangle A115361 as an infinite lower triangular matrix, and B = A127648 (a triangle with the natural numbers as the main diagonal and the rest zeros).

The triangle = A*B, as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle =

1

1, 2

0, 0, 3

1, 2, 0, 4

0, 0, 0, 0, 5

0, 0, 3, 0, 0, 6

0, 0, 0, 0, 0, 0, 7

1, 2, 0, 4, 0, 0, 0, 8

0, 0, 0, 0, 0, 0, 0, 0, 9

0, 0, 0, 0, 5, 0, 0, 0, 0, 10

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11

0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 12

...

CROSSREFS

Cf. A115361, A127648, A129527

Sequence in context: A082660 A134673 A131636 * A077888 A319668 A167634

Adjacent sequences:  A188020 A188021 A188022 * A188024 A188025 A188026

KEYWORD

tabl,nonn

AUTHOR

Gary W. Adamson, Mar 19 2011

STATUS

approved

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Last modified February 27 06:03 EST 2020. Contains 332299 sequences. (Running on oeis4.)