30696

Appears in sequences

• Number of equilateral triangles with coordinates (x,y,z) in the set {0, 1,...,n}.at n=7A102698
• a(n) = 1728*n - 408.at n=17A157266
• G.f. is the polynomial (1-x^3) * (1-x^6) * (1-x^9) * (1-x^12) * (1-x^15) * (1-x^18) * (1-x^21) / (1-x)^7.at n=15A162595
• Number of partitions of n that do not contain 1 as a part and whose parts are not the same divisor of n.at n=50A167928
• Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths starting at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 9, n >= 2.at n=39A214042
• Number of (6+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.at n=13A253703
• Number of integer partitions whose sum of primes of parts equals their sum of parts plus n.at n=42A331387
• Numbers k whose decimal representation can be split in three parts which can be used as seeds for a tribonacci-like sequence containing k itself.at n=27A383230