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%I #8 Jun 26 2020 15:24:13
%S 0,1,6,6,18,6,30,18,54,6,30,30,78,18,90,54,150,6,30,30,78,30,126,78,
%T 222,18,90,90,234,54,246,150,390,6,30,30,78,30,126,78,222,30,126,126,
%U 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
%N First differences of A335794.
%C Position of 6 occurs every 2^(n-1) + 1 for n > 0.
%C Position of 18 appears to occur according to the tetranacci numbers (cf. A000288): 4, 7, 13, 25, 49, ...
%D 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).
%e When written as a triangle:
%e 0
%e 1
%e 6
%e 6 18
%e 6 30 18 54
%e 6 30 30 78 18 90 54 150
%e 6 30 30 78 30 126 78 222 18 90 90 234 54 246 150 390
%e ...
%Y Cf. A000288, A151723, A335794.
%K nonn
%O 0,3
%A _Cody B Duncan_, Jun 23 2020
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