A253767 Partial sums of A247666.

1, 8, 15, 40, 47, 96, 121, 224, 231, 280, 329, 504, 529, 704, 807, 1216, 1223, 1272, 1321, 1496, 1545, 1888, 2063, 2784, 2809, 2984, 3159, 3784, 3887, 4608, 5017, 6656, 6663, 6712, 6761, 6936, 6985, 7328, 7503, 8224, 8273, 8616, 8959, 10184, 10359, 11584, 12305, 15168, 15193, 15368, 15543, 16168

Offset

0,2

Comments

Also, total number of ON cells after n generations in a three-dimensional cellular automaton where A247666(n) gives the number of ON cells in the n-th level of the structure starting from the top. An ON cell remains ON forever. An ON cell is an hexagonal prism of height 1. We start with a single ON cell. The structure looks like an irregular stepped pyramid, apparently with a like-hexagonal base.

Links

Table of n, a(n) for n=0..51.

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Index entries for sequences related to cellular automata

Crossrefs

Cf. A116520, A245542, A247666, A253908.

Sequence in context: A197602 A306599 A226151 * A254541 A137658 A275277

Adjacent sequences: A253764 A253765 A253766 * A253768 A253769 A253770

Keyword

nonn

Author

Omar E. Pol, Jan 29 2015

Status

approved