2309416

Appears in sequences

• Imaginary part of g.f. C(x) that satisfies: C(x) = 1 + x*C(I*x)^2.at n=17A193378
• Number of n X 4 nonnegative integer arrays with upper left 0 and every value within 2 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.at n=15A252816