21438
domain: N
Appears in sequences
- a(n) = ceiling((n^3)/2).at n=35A036486
- Thickened cube numbers: a(n) = n*(n^2 + (n-1)^2) + (n-1)*2*n*(n-1).at n=17A050492
- 63-gonal numbers: a(n) = n*(61*n - 59)/2.at n=27A098140
- a(n) = (2*n^3 + 5*n^2 - 5*n)/2.at n=26A162265
- Sigma(n)-n values in A085844.at n=17A216383
- Number of sets of 4 distinct collinear points in an n X n permutation array in which leftmost pair has same spacing as rightmost pair.at n=19A234471
- The number of orbits of 4-tuples of the dihedral group of order 2n acting on {1,2,...,n}.at n=34A236332
- Number of partitions of n^3 into at most two parts.at n=35A274324
- a(n) = (1/3)*A099432(n+1).at n=6A291386
- a(n) = Sum_{1 <= i <= j <= k <= n} gcd(i,j,k).at n=43A344521
- a(n) is the total sum of area over all (>=,>=)-polyominoes of length n.at n=9A382989