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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.

A109268 Expansion of 1/((1-xc(x)-x^2c(x)^2)(1-x^2c(x))) with c(x) the g.f. of A000108.

Table of values

n a(n)
0 1
1 1
2 4
3 11
4 36
5 119
6 407
7 1418
8 5018
9 17971
10 64989
11 236915
12 869518
13 3209735
14 11907644
15 44368636
16 165957615
17 622880402
18 2345005449
19 8852862717
20 33505203060
21 127096279124
22 483127286394
23 1840030664115
24 7020349647422

List of values

[1, 1, 4, 11, 36, 119, 407, 1418, 5018, 17971, 64989, 236915, 869518, 3209735, 11907644, 44368636, 165957615, 622880402, 2345005449, 8852862717, 33505203060, 127096279124, 483127286394, 1840030664115, 7020349647422]

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

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