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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A169788 a(n) = n(n+1)/2 - A169780(n).

Original entry on oeis.org

0, 0, 0, 1, 1, 4, 6, 7, 7, 14, 20, 25, 27, 30, 36, 37, 37, 52, 66, 79, 89, 100, 112, 117, 115, 122, 140, 153, 157, 158, 168, 167, 167, 198, 228, 257, 283, 310, 338, 359, 373, 396, 428, 453, 467, 474, 486, 491, 481, 496, 538, 575, 603, 628, 654, 665, 653, 650, 680, 707, 711
Offset: 0

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Author

N. J. A. Sloane, May 13 2010

Keywords

Comments

If n is a power of 2, this is the number of OFF cells after n stages in a 60-degree wedge of the hexagonal CA (see A170905, A169780, A151723, A169789).

Links

Crossrefs

Cf. A170905, A169780, A151723, A169789.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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