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 A350281 Square array filled and read by antidiagonals upwards; the first value is 0; if the previous value has already appeared in the table, then the next value is the square of the distance to the nearest earlier position with the same value; otherwise the next value is 0. 1
 0, 0, 1, 0, 1, 1, 1, 5, 0, 4, 0, 4, 13, 0, 1, 4, 5, 4, 1, 5, 10, 0, 4, 1, 5, 5, 1, 2, 0, 1, 5, 2, 25, 0, 5, 4, 16, 0, 1, 1, 2, 1, 4, 5, 1, 10, 106, 0, 1, 1, 1, 1, 1, 2, 5, 5, 29, 0, 1, 1, 1, 1, 1, 1, 1, 2, 5, 1, 13, 49, 0, 4, 17, 0, 8, 0, 8, 8, 2, 73, 0, 4, 13, 5, 13, 8, 5, 10, 25, 37, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 COMMENTS This sequence is a two-dimensional variant of Van Eck's sequence (A181391). When working on a square spiral, we quickly end with all 1's: 1--1--1--1--1--1--1 | | 1 1--1--0-13--2 1 . | | | . 1 1--0--1 0 1 . | | | | | 1 4 0--0 5 1 | | | | 1 0--2--0--1 1 | | 1--1--1--1--1--1 LINKS Rémy Sigrist, Table of n, a(n) for n = 0..10010 Rémy Sigrist, C++ program EXAMPLE Square array begins: n\k| 0 1 2 3 4 5 6 7 8 9 ---+---------------------------------------- 0| 0 1 1 4 1 10 2 4 1 5 1| 0 1 0 0 5 1 5 5 2 1 2| 0 5 13 1 5 0 4 1 1 0 3| 1 4 4 5 25 1 1 1 8 10 4| 0 5 1 2 2 1 1 0 5 1 5| 4 4 5 1 1 1 17 8 5 1 6| 0 1 1 1 1 4 13 1 1 29 7| 0 0 0 1 0 5 5 1 25 2 8| 16 106 0 49 13 1 1 2 5 20 9| 10 29 13 4 4 1 8 5 0 2 PROG (C++) See Links section. CROSSREFS Cf. A001481, A181391. Sequence in context: A258754 A175296 A076266 * A354053 A200102 A016581 Adjacent sequences: A350278 A350279 A350280 * A350282 A350283 A350284 KEYWORD nonn,tabl AUTHOR Rémy Sigrist, Mar 27 2022 STATUS approved

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Last modified February 7 12:58 EST 2023. Contains 360123 sequences. (Running on oeis4.)