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A167194 Triangle read by rows. A130713 in the columns. 3
1, 2, 1, 1, 2, 1, 0, 1, 2, 1, 0, 0, 1, 2, 1, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

FORMULA

From Peter Bala, Sep 12 2012: (Start)

T(n,k) = binomial(2,n-k).

O.g.f.: (1+x)^2/(1-t*x).

Riordan array ((1+x)^2,x).

Matrix inverse is signed version of A004736. (End)

EXAMPLE

Table begins:

1,

2,1,

1,2,1,

0,1,2,1,

0,0,1,2,1,

0,0,0,1,2,1,

0,0,0,0,1,2,1,

0,0,0,0,0,1,2,1,

0,0,0,0,0,0,1,2,1,

0,0,0,0,0,0,0,1,2,1,

0,0,0,0,0,0,0,0,1,2,1,

CROSSREFS

Cf. A130713. A004736.

Sequence in context: A014570 A015131 A282716 * A185018 A099075 A307016

Adjacent sequences:  A167191 A167192 A167193 * A167195 A167196 A167197

KEYWORD

nonn,tabl

AUTHOR

Mats Granvik, Oct 30 2009

STATUS

approved

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Last modified November 15 06:28 EST 2019. Contains 329144 sequences. (Running on oeis4.)