1,2

a(n)/a(n-1) tends to 6.7550711321...

Mathworld, Golay Code

a(n) = term (1,1) in M^n * [1,0,0,0,...]; M = parity check matrix for the binary Golay code.

M = the 11 by 12 matrix:

1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1;

1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1;

1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0;

1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0;

1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0;

1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1;

1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0;

1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0;

1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1;

1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1;

0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;

a(3) = 40 = term (1,1) in M^3.

Sequence in context: A081364 A043019 A054604 this_sequence A001656 A087632 A124306

Adjacent sequences: A157791 A157792 A157793 this_sequence A157795 A157796 A157797

nonn

Gary W. Adamson & Roger L. Bagula (qntmpkt(AT)yahoo.com), Mar 07 2009