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 A335795 First differences of A335794. 2
 0, 1, 6, 6, 18, 6, 30, 18, 54, 6, 30, 30, 78, 18, 90, 54, 150, 6, 30, 30, 78, 30, 126, 78, 222, 18, 90, 90, 234, 54, 246, 150, 390, 6, 30, 30, 78, 30, 126, 78, 222, 30, 126, 126, 318, 78, 366, 222, 606, 18, 90, 90, 234, 90, 378, 234, 666, 54, 246, 246, 630, 150, 630, 390, 966, 6, 30, 30, 78, 30, 126, 78, 222, 30, 126, 126, 318 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Position of 6 occurs every 2^(n-1) + 1 for n > 0. Position of 18 appears to occur according to the tetranacci numbers (cf. A000288): 4, 7, 13, 25, 49, ... REFERENCES S. M. Ulam, On some mathematical problems connected with patterns of growth of figures, pp. 215-224 of R. E. Bellman, ed., Mathematical Problems in the Biological Sciences, Proc. Sympos. Applied Math., Vol. 14, Amer. Math. Soc., 1962 (see Example 6, page 224). LINKS EXAMPLE When written as a triangle: 0 1 6 6 18 6 30 18 54 6 30 30 78 18 90  54 150 6 30 30 78 30 126 78 222 18 90 90 234 54 246 150 390 ... CROSSREFS Cf. A000288, A151723, A335794. Sequence in context: A315814 A038518 A151724 * A315815 A298026 A315816 Adjacent sequences:  A335792 A335793 A335794 * A335796 A335797 A335798 KEYWORD nonn AUTHOR Cody B Duncan, Jun 23 2020 STATUS approved

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Last modified September 17 14:07 EDT 2021. Contains 347478 sequences. (Running on oeis4.)