43624

Appears in sequences

• Central coefficients in Product_{k=1..n} (1 + k*y + y^2).at n=7A201826
• Triangle in which row n lists the coefficients in Product_{k=1..n} (1 + k*x + x^2), for n>=0, as read by rows.at n=56A249790
• a(1) = 0, a(2) = 1; and for n > 2, a(n) = 2*a(A285712(n)) + [1 == (n mod 3)].at n=29A292591