cp's OEIS Frontend

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.

Showing 1-2 of 2 results.

A186026 Hankel transform of Thue-Morse related sequence A106400.

Original entry on oeis.org

1, 1, -2, 4, 8, -16, -32, -64, 128, -256, -1536, -3072, 2048, 4096, 8192, -16384, 32768, -65536, -393216, -2359296, 14155776, 28311552, -94371840, 62914560, 8388608, 16777216, -570425344, -1140850688, -134217728, 268435456, -8053063680, 16106127360, 2147483648, -4294967296, 111669149696, 670014898176, 927712935936, 5566277615616
Offset: 0

Views

Author

Paul Barry, Feb 10 2011

Keywords

Links

Crossrefs

Cf. A106400, A186027, A186028.

Programs

  • PARI
    a(n) = matdet(matrix(n, n, i, j, (-1)^hammingweight(i+j-2))); \\ Michel Marcus, Apr 13 2020

Formula

a(n) = Product{k=0..n} (A186027(k)/A186028(k))^(n-k).

Extensions

a(0)=1 inserted by Michel Marcus, May 16 2020

A186027 Numerators of coefficients of x^2 in continued fraction expansion of A106400.

Original entry on oeis.org

1, -2, 1, -1, -1, -1, 1, -1, 1, -3, 1, -1, -3, 1, -1, 1, 1, -3, 1, -1, -1, -5, 1, -1, 15, -17, -1, 1, -17, 15, 1, -1, -15, 13, -3, 3, 13, -19, 3, -3, 19, -37, 15, -15, -37, -113, 15, -15, -113, 111, -17, 17, -111, -467, -17, 17, -467, 465, 1, -1, -31, 1
Offset: 0

Views

Author

Paul Barry, Feb 10 2011

Keywords

Comments

Corresponding denominators are A186028.

Links

Crossrefs

Cf. A186026, A186028.

Extensions

a(0)=1 inserted by Michel Marcus, May 16 2020
Showing 1-2 of 2 results.

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