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 A334222 a(n) is the X-coordinate of the point at n steps backward from the origine along the space filling curve U defined in A334188; sequence A334223 gives Y-coordinates. 3
 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 1, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 5, 4, 4, 4, 3, 3, 3, 2, 1, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 1, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 LINKS Rémy Sigrist, Table of n, a(n) for n = 0..8318 Rémy Sigrist, PARI program for A334222 FORMULA A334188(A334223(n), a(n)) = -n. EXAMPLE The "backward" branch of curve U starting from the origin is as follows:      |                                  |     7|  -15..-16  -21..-22  -31..-32  -37      |    |    |    |    |    |    |    |     6|  -14  -17  -20  -23  -30  -33  -36      |    |    |    |    |    |    |    |     5|  -13  -18..-19  -24  -29  -34..-35      |    |              |    |     4|  -12..-11..-10  -25  -28      |              |    |    |     3|   -3...-4   -9  -26..-27      |    |    |    |     2|   -2   -5   -8      |    |    |    |     1|   -1   -6...-7      |    |     0|    0   ---+-----------------------------------   y/x|    0    1    2    3    4    5    6 - hence a(4) = a(5) = a(6) = a(11) = a(16) = a(17) = a(18) = 1. PROG (PARI) See Links section. CROSSREFS Cf. A334188, A334223. Sequence in context: A216953 A326786 A276206 * A124752 A293730 A318722 Adjacent sequences:  A334219 A334220 A334221 * A334223 A334224 A334225 KEYWORD nonn AUTHOR Rémy Sigrist, Apr 19 2020 STATUS approved

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Last modified September 23 01:32 EDT 2020. Contains 337291 sequences. (Running on oeis4.)