A342627 Second differences of the y-coordinates of the vertices of the Babylonian Wurm.

0, -1, -1, -1, -1, 0, 0, -1, 0, 1, 1, -1, 2, -1, -2, -1, -1, 0, 0, 1, -1, -1, 0, 1, -1, 0, 1, -2, 0, 0, 2, 3, -2, 1, 4, 1, 1, 3, -2, 1, 3, 1, 2, 0, -1, 1, -2, 2, -1, 2, 0, 0, -3, -1, -1, -2, -4, -1, -4, 3, -5, 4, -3, 2, -5, -1, -2, 1, -2, 0, 1, 2, -1, -1, -1

Offset

1,13

Comments

Equivalently, the first differences of A342625.

Links

James Rayman, Table of n, a(n) for n = 1..10000

Index entries for sequences related to coordinates of 2D curves

Formula

a(n) = A342623(n+2) - 2*A342623(n+1) + A342623(n).

Prog

(Python) for i in range(10000): print(i+1, wurm(i+2)[1] - 2*wurm(i+1)[1] + wurm(i)[1]) # wurm is defined in the program for A256175

Crossrefs

See A256175 for the definition of the Babylonian Wurm.

See A342622 and A342623 for the coordinates of the Wurm.

See A342624 and A342625 for the first differences.

See A342626 for the second differences of the x-coordinates.

Sequence in context: A128410 A059782 A093654 * A220115 A039924 A349218

Adjacent sequences: A342624 A342625 A342626 * A342628 A342629 A342630

Keyword

sign,easy

Author

James Rayman, Apr 18 2021

Status

approved