

A114002


Expansion of x^k(1+x^(k+1))/(1x^(k+1)).


3



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

0,2


COMMENTS

Inverse is A114004. Row sums are A114003.


LINKS

Table of n, a(n) for n=0..104.


FORMULA

Column k has g.f. x^k(1+x^(k+1))/(1x^(k+1))
Equals 2*A051731  I, I = Identity matrix.  Gary W. Adamson, Nov 07 2007


EXAMPLE

Triangle begins
1;
2,1;
2,0,1;
2,2,0,1;
2,0,0,0,1;
2,2,2,0,0,1;
2,0,0,0,0,0,1;


CROSSREFS

Cf. A051731.
Sequence in context: A135387 A127442 A115628 * A114004 A049986 A218797
Adjacent sequences: A113999 A114000 A114001 * A114003 A114004 A114005


KEYWORD

easy,nonn,tabl


AUTHOR

Paul Barry, Nov 12 2005


STATUS

approved



