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 A334221 a(n) is the Y-coordinate of the point at n steps forward from the origine along the space filling curve U defined in A334188; sequence A334220 gives X-coordinates. 3
 0, 0, 0, 0, 1, 2, 2, 1, 0, 0, 0, 0, 1, 2, 3, 3, 2, 1, 1, 2, 3, 4, 4, 4, 5, 6, 6, 5, 4, 4, 4, 3, 2, 1, 1, 2, 3, 3, 2, 1, 0, 0, 0, 0, 1, 2, 2, 1, 0, 0, 0, 0, 1, 2, 3, 3, 2, 1, 1, 2, 3, 4, 4, 4, 5, 6, 7, 7, 6, 5, 5, 6, 7, 7, 6, 5, 4, 3, 3, 4, 5, 6, 7, 7, 6, 5, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS Rémy Sigrist, Table of n, a(n) for n = 0..8066 Rémy Sigrist, PARI program for A334221 FORMULA A334188(a(n), A334220(n)) = n. EXAMPLE The "forward" branch of curve U starting from the origin is as follows:      |     6|                                      25..      |                                       |     5|                                      24      |                                       |     4|                            21...22...23      |                             |     3|                            20   15...14      |                             |    |    |     2|                   5....6   19   16   13      |                   |    |    |    |    |     1|                   4    7   18...17   12      |                   |    |              |     0|    0....1....2....3    8....9...10...11   ---+----------------------------------------   y/x|    0    1    2    3    4    5    6    7 - hence a(5) = a(6) = a(13) = a(16) = a(19) = 2. PROG (PARI) See Links section. CROSSREFS Cf. A334188, A334220. Sequence in context: A016370 A334577 A219494 * A089069 A143535 A301366 Adjacent sequences:  A334218 A334219 A334220 * A334222 A334223 A334224 KEYWORD nonn,look AUTHOR Rémy Sigrist, Apr 19 2020 STATUS approved

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Last modified September 24 04:42 EDT 2020. Contains 337317 sequences. (Running on oeis4.)