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A177991 Triangle read by rows, A070909 * A177990 3
1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,8

COMMENTS

Row sums = A117142: (1, 2, 3, 5, 6, 9,...)

LINKS

Table of n, a(n) for n=0..64.

FORMULA

As infinite lower triangular matrices, A070909 * A177990

EXAMPLE

First few rows of the triangle =

1;

1, 1;

1, 1, 1;

1, 2, 1, 1;

1, 2, 1, 1, 1;

1, 3, 1, 2, 1, 1;

1, 3, 1, 2, 1, 1, 1;

1, 4, 1, 3, 1, 2, 1, 1;

1, 4, 1, 3, 1, 2, 1, 1, 1;

1, 5, 1, 4, 1, 3, 1, 2, 1, 1;

1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;

1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1;

1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;

1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1;

1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;

...

CROSSREFS

A177994 = A177990 * A070909.

Cf. A117142.

Sequence in context: A143898 A238747 A101873 * A146289 A079211 A214575

Adjacent sequences:  A177988 A177989 A177990 * A177992 A177993 A177994

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 16 2010

STATUS

approved

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Last modified March 19 17:05 EDT 2019. Contains 321330 sequences. (Running on oeis4.)