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 A263265 Irregular triangle T(n,k), n >= 0, k = 1 .. A262507(n), read by rows, where each row n lists in ascending order all integers x for which A155043(x) = n. 13
 0, 1, 2, 3, 4, 6, 5, 8, 9, 10, 12, 7, 11, 14, 18, 13, 15, 16, 20, 22, 17, 24, 25, 26, 28, 30, 19, 21, 32, 34, 23, 38, 40, 42, 27, 44, 46, 48, 29, 36, 49, 50, 52, 54, 56, 60, 31, 33, 58, 72, 35, 62, 66, 84, 37, 39, 68, 70, 96, 41, 45, 74, 76, 78, 80, 104, 108, 43, 47, 81, 82, 88, 90, 120, 51, 83, 85, 86, 94, 128, 132, 53, 55, 87, 92, 102, 136, 140 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA Other identities. For all n >= 0: A155043(a(n)) = A263270(n). EXAMPLE Rows 0 - 8 of the triangle: 0; 1, 2; 3, 4, 6; 5, 8, 9, 10, 12; 7, 11, 14, 18; 13, 15, 16, 20, 22; 17, 24, 25, 26, 28, 30; 19, 21, 32, 34; 23, 38, 40, 42; Row n contains A262507(n) terms, the first of which is A261089(n) and the last of which is A262503(n). For all terms on row n, A155043(n) = n. PROG (Scheme, with Antti Karttunen's IntSeq-library) (defineperm1 (A263265 n) (cond ((zero? n) n) ((= 1 (- (A263270 n) (A263270 (- n 1)))) (A261089 (A263270 n))) (else (let ((p (A263265 (- n 1))) (d (A263270 n))) (let loop ((k (+ p 1))) (if (= (A155043 k) d) k (loop (+ k 1)))))))) CROSSREFS Inverse: A263266. Cf. A261089 (left edge), A262503 (right edge), A262507 (number of terms on each row). Cf. A263279 (gives the positions of terms of A259934 on each row), A263280 (and their distance from the right edge). Cf. A155043, A263259, A263270. Cf. also permutations A263267 & A263268 and A263255 & A263256. Differs from A263267 for the first time at n=31, where a(31) = 38, while A263267(31) = 40. Sequence in context: A094138 A116538 A084287 * A263267 A257471 A053212 Adjacent sequences:  A263262 A263263 A263264 * A263266 A263267 A263268 KEYWORD nonn,tabf AUTHOR Antti Karttunen, Nov 24 2015 STATUS approved

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Last modified February 22 15:05 EST 2020. Contains 332137 sequences. (Running on oeis4.)