0,5

Right border = A000587, the Rao Uppuluri-Carpenter numbers, with different signs: (1, 1, 0, 1, 1, 2, 9, -9, 50, -267, -413, -2180,...).

Row sums = the same sequence shifted: (1, 0, 1, 1, 2, 9,...).

Let A = the self-inverse triangle, A118433. Shift the triangle down one place placing "1" at (0,0). Lim(n..->inf.) A^n, = a signed version B of the Rao Uppuluri-Carpenter numbers (A000587), as follows: (1, 1, 0, 1, 1, 2, 9, -9, 50, -267, -413, -2180,...). A000587 = (1, -1, 0, 1, 1, -2, -9, -9, 50, 267, 413, -2180,...). Triangle A144185 = (A * (an infinite lower triangular matrix with B as the main diagonal and the rest zeros)). These operations are equivalent to (by rows), taking termwise products of A118433 row terms and B, the signed version of the Rao Uppuluri-Carpenter numbers.

First few rows of the triangle =

1;

1, -1;

-1, 2, 0;

-1, 3, 0, -1,

1, -4, 0, 4, 1;

1, -5, 0, 10, 5, -2;

-1, 6, 0, -20, -15, 12, 9;

-1, 7, 0, -35, -35, 42, 63, 9;

1, -8, 0, 56, 70, -112, -252, -72, 50;

1, -9, 0, 84, 126, -252, -756, -324, 450, 267;

-1, 10, 0, -120, -210, 504, 1890, 1080, -2250, -2670, -413;

...

Example: row 5 = (1, -5, 0, 10, 5, -2) = termwise products of row 5 of the self-inverse triangle A118433: (1, -5, -10, 10, 5, -1) and the first 6 terms of the "B" signed version of A000587 (the rao Uppuluri-Carpenter numbers): (1, 1, 0, 1, 1, 2) = (1*1, -5*1, 0*0, 10*1, 5*1, -5*2).

A000587, Cf. A118434

Sequence in context: A141097 A096335 A129503 this_sequence A143987 A112760 A096087

Adjacent sequences: A144182 A144183 A144184 this_sequence A144186 A144187 A144188

tabl,sign

Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 13 2008