cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A109245 Diagonal sums of number triangle A109244.

Original entry on oeis.org

1, 1, 5, 15, 54, 193, 708, 2627, 9846, 37178, 141223, 539047, 2065813, 7943706, 30634329, 118433821, 458867295, 1781267606, 6926405025, 26973935420, 105189301334, 410707352869, 1605379739149, 6281519778025, 24601184635436
Offset: 0

Views

Author

Paul Barry, Jun 23 2005

Keywords

Formula

G.f.: 1/((1-xc(x)-2x^2c(x)^2)(1-x^2c(x))), c(x) the g.f. of A000108.

A109246 Riordan array (1-x-2x^2,x(1-x)).

Original entry on oeis.org

1, -1, 1, -2, -2, 1, 0, -1, -3, 1, 0, 2, 1, -4, 1, 0, 0, 3, 4, -5, 1, 0, 0, -2, 2, 8, -6, 1, 0, 0, 0, -5, -2, 13, -7, 1, 0, 0, 0, 2, -7, -10, 19, -8, 1, 0, 0, 0, 0, 7, -5, -23, 26, -9, 1, 0, 0, 0, 0, -2, 14, 5, -42, 34, -10, 1, 0, 0, 0, 0, 0, -9, 19, 28, -68, 43, -11, 1, 0, 0, 0, 0, 0, 2, -23, 14, 70, -102, 53, -12, 1, 0, 0, 0, 0, 0, 0, 11, -42, -14
Offset: 0

Views

Author

Paul Barry, Jun 23 2005

Keywords

Comments

Matrix inverse of A109244. Row sums are A109247. Diagonal sums are A109248.

Examples

			Rows begin
1;
-1,1;
-2,-2,1;
0,-1,-3,1;
0,2,1,-4,1;
0,0,3,4,-5,1
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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