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A114002
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Expansion of x^k(1+x^(k+1))/(1-x^(k+1)).
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2
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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
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Inverse is A114004. Row sums are A114003.
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FORMULA
| Column k has g.f. x^k(1+x^(k+1))/(1-x^(k+1))
Equals 2*A051731 - I, I = Identity matrix. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 07 2007
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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;
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CROSSREFS
| Cf. A051731.
Sequence in context: A135387 A127442 A115628 * A114004 A049986 A137289
Adjacent sequences: A113999 A114000 A114001 * A114003 A114004 A114005
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Nov 12 2005
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