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A156836 Triangle read by rows, A156348 * A130207 0
1, 1, 1, 1, 0, 2, 1, 2, 0, 2, 1, 0, 0, 0, 4, 1, 3, 6, 0, 0, 2, 1, 0, 0, 0, 0, 0, 6, 1, 4, 0, 8, 0, 0, 0, 4, 1, 0, 12, 0, 0, 0, 0, 0, 6, 1, 5, 0, 0, 20, 0, 0, 0, 0, 4, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 1, 6, 20, 20, 0, 12, 0, 0, 0, 0, 0, 4, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

Row sums = A156834: (1, 2, 3, 5, 5, 12, 7, 17, 19, 30, 11,...).

LINKS

Table of n, a(n) for n=1..91.

FORMULA

Triangle read by rows, A156348 * A130207, where A130207 = an infinite lower

triangular matrix with A000010 as the main diagonal and the rest zeros.

EXAMPLE

First few rows of the triangle =

1;

1, 1;

1, 0, 2;

1, 2, 0, 2;

1, 0, 0, 0, 4;

1, 3, 6, 0, 0, 2;

1, 0, 0, 0, 0, 0, 6;

1, 4, 0, 8, 0, 0, 0, 4;

1, 0, 12, 0, 0, 0, 0, 0, 6;

1, 5, 0, 0, 20, 0, 0, 0, 0, 4;

1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10;

1, 6, 20, 20, 0, 12, 0, 0, 0, 0, 0, 4;

1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12;

1, 7, 0, 0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 6;

...

CROSSREFS

Cf. A156348, A130207, A156834, A000010

Sequence in context: A274263 A046920 A107599 * A287438 A079483 A262115

Adjacent sequences:  A156833 A156834 A156835 * A156837 A156838 A156839

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson & Mats Granvik, Feb 16 2009

STATUS

approved

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Last modified October 15 03:16 EDT 2019. Contains 328025 sequences. (Running on oeis4.)