271300

Appears in sequences

• Expansion of x(1-x^2-x^3)/((1-x)(1-x-x^2))^2.at n=20A113684
• Number of double rises at an odd level in all nondecreasing Dyck paths of semilength n. A nondecreasing Dyck path is a Dyck path for which the sequence of the altitudes of the valleys is nondecreasing.at n=12A121530
• Number of nX2 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.at n=18A304257