A334235 a(n) is the X-coordinate of the point at n steps backward from the origine along the H-order curve defined in A334232; sequence A334236 gives Y-coordinates.

0, 0, 0, 0, 1, 1, 2, 2, 2, 2, 1, 1, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 1, 1, 2, 2, 2, 2, 1, 1, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 7, 7, 7, 7, 6, 6, 5

Offset

0,7

Links

Rémy Sigrist, Table of n, a(n) for n = 0..8192

Rémy Sigrist, PARI program for A334235

Index entries for sequences related to coordinates of 2D curves

Formula

A334232(A334236(n), a(n)) = -n.

Example

The "backward" branch of H-order curve starting from the origin is as follows:
    7|  -15..-16  -19..-20  -27..-28  -31
     |    |    |    |    |    |    |    |
    6|  -14  -17..-18  -21  -26  -29..-30
     |    |              |    |
    5|  -13  -10...-9  -22  -25
     |    |    |    |    |    |
    4|  -12..-11   -8  -23..-24
     |              |
    3|   -3...-4   -7
     |    |    |    |
    2|   -2   -5...-6
     |    |
    1|   -1
     |    |
    0|    0
  ---+----------------------------------------
  y/x|    0    1    2    3    4    5    6    7
- hence a(24) = a(25) = a(26) = a(27) = 4.

Prog

(PARI) See Links section.

Crossrefs

Cf. A334232, A334236.

Sequence in context: A340171 A049241 A321858 * A230415 A101080 A130836

Adjacent sequences: A334232 A334233 A334234 * A334236 A334237 A334238

Keyword

nonn

Author

Rémy Sigrist, Apr 20 2020

Status

approved