A106468 Absolute value of inverse of number triangle A106465.

1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1

Offset

0,1

Comments

A 'mixed' sequence array : rows alternate between the rows of the sequence array for the sequence (1,0,1,0,0,0...) and the sequence array for the sequence (1,1,1,1,0,0,0,...). Column 2k has g.f. x^2k(1+x+x^2+x^3); column 2k+1 has g.f. x^(2k+1)(1+x^2). Row sums are A106469. A106468=mod(A106465^(-1),2).

Links

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

Example

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

Crossrefs

Sequence in context: A358847 A187967 A106467 * A030317 A077009 A078556

Adjacent sequences: A106465 A106466 A106467 * A106469 A106470 A106471

Keyword

nonn,tabl

Author

Paul Barry, May 03 2005

Status

approved