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.

A355907 A355906(n)/3.

Original entry on oeis.org

0, 0, -1, 1, -2, 3, -5, 7, -11, 16, -25, 37, -56, 84, -127, 190, -286, 429, -644, 966
Offset: 0

Views

Author

N. J. A. Sloane, Sep 18 2022

Keywords

Comments

This is also -(A355905(n)+A355906(n))/2.

Links

Crossrefs

Cf. A355904-A355906, A355908-A355913.

A355909 Number of nodes at level n in the tree T_0 mentioned in A355905.

Original entry on oeis.org

1, 2, 3, 4, 6, 9, 13, 19, 28, 42, 63, 94, 141, 212, 318, 477, 716, 1074, 1611, 2417, 3626, 5439, 8158, 12237
Offset: 0

Views

Author

N. J. A. Sloane, Sep 19 2022

Keywords

Comments

First differences give A355910.

Links

Crossrefs

Cf. A355904-A355908, A355910-A355913.

Formula

a(n) = 1 + (c(n)+c(n-1))/2 where c(n) = |A355908(n)|.
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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