30558

Appears in sequences

• Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice.at n=11A008893
• T(n,k) = [x^k] Product_{m=1..n} d/dx Sum_{i=1..m} x^i; triangle read by rows, n >= 0, 0 <= k <= A161680(n).at n=50A139769
• Number of nX6 arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 nX6 array.at n=2A219937
• T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 nXk array.at n=30A219939
• Number of 3 X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 3 X n array.at n=5A219941
• Number of partitions p of n such that floor(n/2) is not a part of p.at n=38A238546
• Numbers k such that 4*10^k - 21 is prime.at n=28A256228
• Even numbers 2m such that A352612(2m) = A103131(2m).at n=37A352587
• Number of distinct degree sequences among all simple graphs with n vertices whose degrees are consecutive integers.at n=14A382021