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.

A281587 Triangle read by rows, e.g.f. exp(x*z)*(2*(exp(z)+1)/(cosh(z)+cos(z))-1).

Original entry on oeis.org

1, 1, 1, 1, 2, 1, 1, 3, 3, 1, -1, 4, 6, 4, 1, -4, -5, 10, 10, 5, 1, -14, -24, -15, 20, 15, 6, 1, -34, -98, -84, -35, 35, 21, 7, 1, 69, -272, -392, -224, -70, 56, 28, 8, 1, 496, 621, -1224, -1176, -504, -126, 84, 36, 9, 1, 2896, 4960, 3105, -4080, -2940, -1008, -210, 120, 45, 10, 1
Offset: 0

Views

Author

Peter Luschny, Feb 01 2017

Keywords

Examples

			Triangle starts:
[   1]
[   1,   1]
[   1,   2,   1]
[   1,   3,   3,   1]
[  -1,   4,   6,   4,  1]
[  -4,  -5,  10,  10,  5,  1]
[ -14, -24, -15,  20, 15,  6, 1]
[ -34, -98, -84, -35, 35, 21, 7, 1]
		

Crossrefs

Cf. A130595 (m=1), A109449 (m=2), A215064 (m=3), A281587 (m=4).
Cf. A178964 (col. 0), A281588 (col. 1).

Programs

  • Maple
    A281587_row := proc(n) exp(x*z)*(2*(exp(z)+1)/(cosh(z)+cos(z))-1);
    n!*coeff(series(%,z,n+1),z,n); PolynomialTools:-CoefficientList(%,x) end:
    for n from 0 to 12 do A281587_row(n) od;