155155

Appears in sequences

• Odd square pyramidal numbers.at n=38A015221
• Structured rhombic dodecahedral numbers (vertex structure 9).at n=38A100157
• Triangle T(n,k) read by rows = number of partitions of n-set into k blocks with distinct sizes, k = 1..A003056(n).at n=34A131632
• Area ar/6 (divided by 6) of primitive Pythagorean triangles such that perimeters are Averages of twin prime pairs, q=p+1, a=q^2-p^2, c=q^2+p^2, b=2*p*q, ar=a*b/2; s=a+b+c, s-+1 are primes.at n=11A155177
• Number of shapes of grid-filling curves of order 4*n+1 (on the square grid) with turns by +-90 degrees that are generated by Lindenmayer-systems with just one symbol apart from the turns.at n=19A265685
• Number of set partitions of [n] into three blocks with distinct sizes.at n=7A272515
• a(n) is the smallest square pyramidal number divisible by exactly n square pyramidal numbers.at n=5A359094
• a(n) = A110936(n)/6 for n >= 3.at n=15A366923