cp's OEIS Frontend

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.

Showing 1-2 of 2 results.

A225355 a(n) = A221565(n)/4.

Original entry on oeis.org

0, 1, 2, 4, 4, 4, 7, 12, 8, 4, 8, 16, 16, 20, 21, 28, 16, 4, 8, 16, 24, 28, 36, 44, 34, 28, 24, 44, 44, 52, 49, 60, 32, 4, 8, 16, 24, 28, 38
Offset: 0

Views

Author

Omar E. Pol, May 13 2013

Keywords

Examples

			When written as a irregular triangle begins:
0;
1;
2;
4,4;
4,7,12,8;
4,8,16,16,20,21,28,16;
4,8,16,24,28,36,44,34,28,24,44,44,52,49,60,32;
4,8,16,24,28,38...

Links

Crossrefs

Row lengths give 1 together with A011782. Right border gives 0 together with A000079.
Cf. A139251, A182635, A221565.

A220512 D-toothpick sequence of the third kind starting with a cross formed by 4 toothpicks.

Original entry on oeis.org

0, 4, 12, 28, 44, 60, 88, 136, 168, 184, 216, 280, 344, 424, 508, 620, 684, 700, 732, 796, 892, 1004, 1148, 1324, 1460, 1572, 1668, 1844, 2020, 2228, 2424, 2664, 2792, 2808, 2840, 2904, 3000, 3112, 3264
Offset: 0

Views

Author

Omar E. Pol, Dec 15 2012

Keywords

Comments

This is a toothpick sequence of forking paths to 135 degrees. The sequence gives the number of toothpicks and D-toothpicks in the structure after n-th stage. A221565 (the first differences) give the number of toothpicks or D-toothpicks added at n-th stage. It appears that the structure has a fractal (or fractal-like) behavior. For more information see A194700.
First differs from A194432 at a(14).

Links

Crossrefs

Cf. A139250, A194270, A194432, A194700, A220500, A220514, A220520, A220522, A220524, A220526.
Showing 1-2 of 2 results.

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