36883

Appears in sequences

• G.f. A(x) satisfies A(x) = 1 + x / (1 - x * A(x^2)).at n=24A218032
• a(n) = Sum_{m=0..n} Sum_{i=0..m} i*C(m-i,i)*C(m-i,n-m-i).at n=15A298371