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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.

A200450 Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

Table of values

n a(n)
1 44
2 342
3 2334
4 16380
5 115140
6 820650
7 5876818
8 42324384
9 306098316
10 2222013090
11 16179361028
12 118122171194
13 864377954818
14 6338065287424
15 46557302873890
16 342540516750538
17 2523812868946712
18 18619248362911724
19 137522653687668252

List of values

[44, 342, 2334, 16380, 115140, 820650, 5876818, 42324384, 306098316, 2222013090, 16179361028, 118122171194, 864377954818, 6338065287424, 46557302873890, 342540516750538, 2523812868946712, 18619248362911724, 137522653687668252]

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

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