55149

Appears in sequences

• Group successively larger prime numbers so that the sum of the n-th group is a multiple of n. Sequence gives the sum for each group.at n=30A074128
• Number of nX7 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=2A280479
• T(n,k)=Number of nXk 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=38A280480
• Number of 3Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=6A280482
• Array read by antidiagonals: T(n,k) is the number of proper antichain partitions of the rectangular poset of size n X k.at n=30A378173
• Coefficient of x^n in the expansion of ( (1-x+x^4) / (1-x) )^n.at n=18A387345