217100

Appears in sequences

• Four-fold convolution of Bell numbers with themselves.at n=9A014325
• Number of double rises at an even 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=12A121532
• Number of ways to place 2 nonattacking bishops on an n X n board.at n=25A172123
• Sum of the third largest parts of the partitions of 4n into 4 parts.at n=29A242727