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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.

A027297 a(n) = Sum_{k=0..floor((n-3)/2)} T(n,k) * T(n,k+3), with T given by A026022.

Table of values

n a(n)
3 1
4 4
5 30
6 104
7 567
8 1952
9 9453
10 32900
11 150029
12 528956
13 2327156
14 8303216
15 35679835
16 128633440
17 543723257
18 1977821700
19 8260172309
20 30278441400
21 125314192728
22 462409521376
23 1900445030538
24 7053236494784
25 28828752666375
26 107536008386924
27 437602449724101

List of values

[1, 4, 30, 104, 567, 1952, 9453, 32900, 150029, 528956, 2327156, 8303216, 35679835, 128633440, 543723257, 1977821700, 8260172309, 30278441400, 125314192728, 462409521376, 1900445030538, 7053236494784, 28828752666375, 107536008386924, 437602449724101]

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

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