0,4

a(0)=1, a(n) = (1/(2^(n-1))) * Sum_{i=1..(2^(n-1))} (Sum_{j=0..A007814(i)} A073346(n, j)) = (1/(2^(n-2))) * Sum_{i=1..(2^(n-1))} A073346(n, A007814(i)) - 1 = (1/2^n) * Sum_{i=0..n} (2^(n-i))*A073346(n, i) = Sum_{i=0..n} A074079(n, i)

A073431 := proc(n) local i; (1/2^n) * add((2^(n-i))*A073346bi(n, i), i=0..n); end;

Occurs for first time in A073201 as row 6 (and 8). Column sums of the square array A074079/Row sums of the triangle A074080.

Sequence in context: A122889 A158874 A014280 this_sequence A003317 A145062 A014278

Adjacent sequences: A073428 A073429 A073430 this_sequence A073432 A073433 A073434

nonn

Antti Karttunen Jul 31 2002