104873

Appears in sequences

• Nonnegative walks of length n on the x-axis starting at the origin using steps {1,0,-1} and visiting no point more than twice.at n=15A212586
• Number of binary matrices with 3 distinct columns and any number of nonzero rows with n ones in every column and rows in nonincreasing lexicographic order.at n=33A331390
• Number of integer partitions of 2n with reverse-alternating sum -2.at n=34A344741