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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.

A330528 Expansion of e.g.f. Sum_{k>=1} (sec(x^k) - 1) (even powers only).

Table of values

n a(n)
1 1
2 17
3 421
4 29945
5 1864921
6 382577645
7 43788506581
8 15558403000145
9 3746015060385841
10 1757547389533786325
11 562069712763196977901
12 516878970296221633758905
13 201649817635812110915892361
14 216661054181289983631892988285

List of values

[1, 17, 421, 29945, 1864921, 382577645, 43788506581, 15558403000145, 3746015060385841, 1757547389533786325, 562069712763196977901, 516878970296221633758905, 201649817635812110915892361, 216661054181289983631892988285]

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

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