A342275 First differences of A170899.

0, 1, -1, 1, 1, 1, -3, 1, 1, 2, 0, -1, 3, 1, -7, 1, 1, 2, 0, 0, 4, 4, -4, -5, 3, 5, 2, -4, 6, 0, -15, 1, 1, 2, 0, 0, 4, 4, -4, -4, 4, 6, 4, -2, 4, 8, -12, -13, 3, 5, 2, 0, 8, 12, -4, -16, 2, 12, 7, -10, 10, -3, -31, 1, 1, 2, 0, 0, 4, 4, -4, -4, 4

Offset

0,7

Comments

It would be nice to have a formula or recurrence for any of A170899, A342272-A342278, or any nontrivial relation between them. This might help to understand the fractal structure of the mysterious hexagonal Ulam-Warburton cellular automaton A151723.

Links

N. J. A. Sloane, Table of n, a(n) for n = 0..4091

Crossrefs

Cf. A151723, A170899.

Sequence in context: A297557 A066827 A016467 * A324049 A194510 A331311

Adjacent sequences: A342272 A342273 A342274 * A342276 A342277 A342278

Keyword

sign

Author

N. J. A. Sloane, Mar 14 2021

Status

approved