A089935 - OEIS

%I #12 Dec 25 2019 08:37:02

%S 2,2,4,5,9,11,21,30,51,76

%N Order of recurrence generating row (or column) n of A089934.

%C Table is A089934. Row/columns 1 through 7 are A000045, A001333, A051736, A051737, A089936, A089937, A089938.

%C The only known value where a(n) is strictly less than the theoretical upper bound A001224(n+1) is a(6) = 11. - _Andrew Howroyd_, Dec 24 2019

%F a(n) <= A001224(n+1). - _Andrew Howroyd_, Dec 24 2019

%e a(2)=2 because the recurrence relation for the second row/column is a(n) = 2 a(n-1) + a(n-2).

%Y Cf. A000045, A001224, A001333, A051736, A051737, A089934, A089936, A089937, A089938.

%K nonn,hard,more

%O 1,1

%A _Marc LeBrun_, Nov 15 2003

%E a(8)-a(10) from _Andrew Howroyd_, Dec 24 2019