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.

A166380 Diagonal sums of exponential Riordan array [1+x^2*sec(x),x], A166378.

Table of values

n a(n)
0 1
1 3
2 19
3 223
4 4667
5 160045
6 8207125
7 587420875
8 55869454855
9 6809387511403
10 1034264079708019
11 191477762192490649
12 42435372869814513769
13 11090351278621719882899
14 3374951549996881393302715

List of values

[1, 3, 19, 223, 4667, 160045, 8207125, 587420875, 55869454855, 6809387511403, 1034264079708019, 191477762192490649, 42435372869814513769, 11090351278621719882899, 3374951549996881393302715]

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

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