login
A342627
Second differences of the y-coordinates of the vertices of the Babylonian Wurm.
5
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.
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
KEYWORD
sign,easy
AUTHOR
James Rayman, Apr 18 2021
STATUS
approved