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A145765 Eigentriangle, row sums = A116975, number of compositions of n using terms == (1,4) mod 5 1
1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 2, 1, 0, 1, 0, 0, 3, 0, 1, 0, 1, 0, 0, 5, 0, 0, 1, 0, 2, 0, 0, 7, 1, 0, 0, 1, 0, 30, 0, 10, 0, 1, 0, 0, 2, 0, 50, 0, 15, 1, 0, 1, 0, 0, 3, 0, 7, 0, 0, 23, 0, 1, 0, 1, 0, 0, 50, 10, 0, 0, 35, 0, 0, 1, 0, 2, 0, 0, 7, 0, 15, 0, 0, 52, 1, 0, 0, 1, 0, 3, 0, 0, 10, 0, 23, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,15

COMMENTS

Row sums = A116975, the number of componsitions of n using terms == (1,4) mod 5: (1, 1, 1, 2, 3, 5, 7, 10, 15, 23, 35, 52, 77, 115,...). Sum of n-th row terms = rightmost term of next row.

LINKS

Table of n, a(n) for n=1..100.

FORMULA

Let T = an infinite lower triangular matrix with (1, 0, 0, 1, 0, 1,...repeat...); (i.e. the characteristic function of (1,4) mod 5) in every column. Let X = an infinite lower triangular matrix with A116975 as the main diagonal prefaced with a 1: (1, 1, 1, 1, 2, 3, 5, 7, 10, 15, 23,...).

Triangle A145765 = T * X

EXAMPLE

First few rows of the triangle =

1;

0, 1;

0, 0, 1;

1, 0, 0, 1;

0, 1, 0, 0, 2;

1, 0, 1, 0, 0, 3;

0, 1, 0, 1, 0, 0, 5;

0, 0, 1, 0, 2, 0, 0, 7;

1, 0, 0, 1, 0, 3, 0, 0, 10;

0, 1, 0, 0, 2, 0, 5, 0, 0, 15;

1, 0, 1, 0, 0, 3, 0, 7, 0, 0, 23;

0, 1, 0, 1, 0, 0, 5, 0, 10, 0, 0, 35;

0, 0, 1, 0, 2, 0, 0, 7, 0, 15, 0, 0, 52;

1, 0, 0, 1, 0, 3, 0, 0, 10, 0, 23, 0, 0, 77;

...

CROSSREFS

Cf. A145765.

Sequence in context: A116488 A216601 A283000 * A157424 A144961 A144627

Adjacent sequences:  A145762 A145763 A145764 * A145766 A145767 A145768

KEYWORD

eigen,nonn,tabl

AUTHOR

Gary W. Adamson, Oct 18 2008

STATUS

approved

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Last modified October 21 20:44 EDT 2019. Contains 328315 sequences. (Running on oeis4.)