

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
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OFFSET

0,3


COMMENTS

Position of 6 occurs every 2^(n1) + 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. 215224 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

Table of n, a(n) for n=0..76.


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



