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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.

A136519 a(n) = A027907(2^n+1, n), where A027907 = triangle of trinomial coefficients.

Table of values

n a(n)
0 1
1 3
2 15
3 156
4 4556
5 417384
6 128004240
7 136874853504
8 523288667468832
9 7257782720507161152
10 368292386875012729754240
11 68761030015590030510485191680
12 47447175348985315294381264871833600

List of values

[1, 3, 15, 156, 4556, 417384, 128004240, 136874853504, 523288667468832, 7257782720507161152, 368292386875012729754240, 68761030015590030510485191680, 47447175348985315294381264871833600]

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

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