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A102583 Triangular matrix, read by rows, where row n is formed from the first differences of row (n-1) of its inverse matrix square, with an appended '1' for the main diagonal. 2
1, 1, 1, -2, 3, 1, 13, -19, 7, 1, -209, 310, -115, 15, 1, 7558, -11328, 4315, -575, 31, 1, -584837, 883178, -342761, 46965, -2607, 63, 1, 94047241, -142845383, 56217824, -7856782, 448173, -11199, 127, 1, -30883147262, 47124630966, -18750717425, 2660027115, -154716638, 3969645, -46655, 255, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Row sums are: {1,2,2,2,2,2,...}. Column 0 is A102585. Column 1 is A102586.

LINKS

Table of n, a(n) for n=0..44.

FORMULA

T(n, k) = [T^-2](n-1, k) - [T^-2](n-1, k-1) for n>k>0, with T(n, n)=1 for n>=0 and T(n, 0) = [T^-2](n-1, 0) for n>0.

EXAMPLE

Rows of matrix T begin:

[1],

[1,1],

[ -2,3,1],

[13,-19,7,1],

[ -209,310,-115,15,1],

[7558,-11328,4315,-575,31,1],

[ -584837,883178,-342761,46965,-2607,63,1],

[94047241,-142845383,56217824,-7856782,448173,-11199,127,1],...

and is formed from the first differences of the rows

of the inverse matrix square, T^(-2):

[1],

[ -2,1],

[13,-6,1],

[ -209,101,-14,1],

[7558,-3770,545,-30,1],

[ -584837,298341,-44420,2545,-62,1],...

PROG

(PARI) {T(n, k)=local(A=Mat(1), B); for(m=2, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, if(j==1, B[i, j]=(A^-2)[i-1, 1], B[i, j]=(A^-2)[i-1, j]-(A^-2)[i-1, j-1])); )); A=B); return(A[n+1, k+1])}

CROSSREFS

Cf. A102585, A102586, A102225.

Sequence in context: A107415 A079174 A204137 * A030780 A193683 A145643

Adjacent sequences:  A102580 A102581 A102582 * A102584 A102585 A102586

KEYWORD

sign,tabl

AUTHOR

Paul D. Hanna, Jan 22 2005

STATUS

approved

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Last modified August 1 12:00 EDT 2014. Contains 245118 sequences.