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.

A098543 Column 2 of triangle A098542, which shifts left and up under the matrix square.

Original entry on oeis.org

1, 4, 12, 44, 236, 2028, 29164, 719340, 30943724, 2350770668, 318680099308, 77793540073964, 34472347123476972, 27928291976711924204, 41631598900551078537708, 114829789064202679162399212
Offset: 2

Views

Author

Paul D. Hanna, Sep 16 2004

Keywords

Comments

Related to A002449, the number of different types of binary trees of height n.

Crossrefs

Cf. A002449, A098542, A098544.

Formula

G.f.: A(x) = x*(1+x)/(1-x)*(G002449(x)-1), where G002449(x) is g.f. of A002449.

A098544 Row sums of triangle A098542, which shifts left and up under the matrix square.

Original entry on oeis.org

1, 2, 3, 7, 23, 119, 1015, 14583, 359671, 15471863, 1175385335, 159340049655, 38896770036983, 17236173561738487, 13964145988355962103, 20815799450275539268855, 57414894532101339581199607
Offset: 0

Views

Author

Paul D. Hanna, Sep 16 2004

Keywords

Crossrefs

Cf. A098542, A098543.
Showing 1-2 of 2 results.

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

Content is available under The OEIS End-User License Agreement.