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.

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A140957 a(n) = A140951(n+1) - A140951(n).

Original entry on oeis.org

2, 2, 1, 4, 1, 1, 8, 1, 1, 2, 16, 2, 1, 1, 4, 32, 4, 1, 1, 2, 8, 64, 8, 2, 1, 1, 4, 16, 128, 16, 4, 1, 1, 2, 8, 32, 256, 32, 8, 2, 1, 1, 4, 16, 64, 512, 64, 16, 4, 1
Offset: 0

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Author

Paul Curtz, Jul 26 2008

Keywords

Comments

All terms belong to A000079.
Note that the positions of the first occurrences of 4, 8, 16, 32, 64, ... are 3, 6, 10, 15, 21, ...
So a(n) can be displayed as a triangle (hence the tabl keyword), with row sums: 2, 3, 6, 12, 24, 48, ... = A042950.
2;
2, 1;
4, 1, 1;
8, 1, 1, 2;
It can also be displayed as an irregular table, with length distribution: 1, 1, 3, 3, 5, 5, 7, 7, 9, 9 (doubled A005408) to get palindromic lines.
2;
2;
1, 4, 1;
1, 8, 1;
1, 2, 16, 2, 1;
1, 4, 32, 4, 1;
with row sums: 2, 2, 6, 10, 22, 42, 66, 170, 342, 682, ... = A078008(n+2) = 2*A001045(n+1).

Crossrefs

Cf. A000079, A042950, A140951, A140643.

Extensions

Edited by Michel Marcus, Jan 11 2012
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