16818516

Appears in sequences

• a(n) = Product_{i=1..n} ((i+5)*(i+6)*(i+7)*(i+8)*(i+9))/(i*(i+1)*(i+2)*(i+3)*(i+4)).at n=4A047831
• Number of antichains (or order ideals) in the poset 5*m*n or plane partitions with not more than m rows, n columns and entries <= 5.at n=49A056941
• Number of antichains (or order ideals) in the poset 5*m*n or plane partitions with not more than m rows, n columns and entries <= 5.at n=50A056941
• Number of ways to tile hexagon of edges n, n+1, n+1, n, n+1, n+1 with diamonds of side 1.at n=4A071095
• Square array T(n,k) read by antidiagonals: number of tilings of an <n,k,n> hexagon.at n=40A103905
• Triangle of Hankel transforms of binomial(n+k, k).at n=49A120247
• Triangle of Hankel transforms of certain binomial sums.at n=40A120257
• Triangle of central coefficients of generalized Pascal-Narayana triangles.at n=49A120258
• Number of 4 X 5 matrices with elements in 0..n with each row and each column in nondecreasing order. 4,5,n can be permuted, see formula.at n=5A140902
• a(n) is the number of secondary GL(4) invariants contructed from n+3 distinct four component vectors.at n=5A383823