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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.

A127946 Hankel transform of central coefficients of (1+k*x-3x^2)^n, k arbitrary integer.

Table of values

n a(n)
0 1
1 -6
2 -108
3 5832
4 944784
5 -459165024
6 -669462604992
7 2928229434235008
8 38424226636031774976
9 -1512608105754026853705216
10 -178635992073339063368878599168
11 63289660175631590117213474413627392
12 67269440586795655766964092111705109663744

List of values

[1, -6, -108, 5832, 944784, -459165024, -669462604992, 2928229434235008, 38424226636031774976, -1512608105754026853705216, -178635992073339063368878599168, 63289660175631590117213474413627392, 67269440586795655766964092111705109663744]

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

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