21695

Appears in sequences

• Shifts one place left under the square binomial transform (A008459): a(0) = 1, a(n) = Sum_{k=0..n-1} C(n-1,k)^2*a(k).at n=7A101514
• Numbers of pyramid polycubes of a given volume in dimension 4.at n=16A229916
• Number of partitions p of n such that the m(M(p)) is a part, where m = multiplicity, M = the minimum multiplicity of the parts of p.at n=42A240539
• Numbers k such that (265*10^k + 17)/3 is prime.at n=25A272523
• a(n) = Sum_{k=1..n} (A000330(n) mod k^2).at n=48A344711