71512

Appears in sequences

• Irregular triangle read by rows: Whitney numbers of the second kind a(n,k), n >= 1, k >= 0, for the star poset.at n=55A007799
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and positive even determinant.at n=21A210372
• Number of integer compositions of n into parts that are alternately equal and unequal.at n=40A357643