23400
domain: N
Appears in sequences
- a(n) = n*(n+1)*(n+2)*(n+7)/24.at n=25A005582
- a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=27A011928
- a(n) = floor(n*(n-1)*(n-2)*(n-3)/21).at n=28A011931
- Theta series of D*_27 lattice.at n=12A022080
- "BIK" (reversible, indistinct, unlabeled) transform of 1,2,3,4...at n=11A032126
- Number of points of l_1 norm n in the "diamond" lattice D^+_4.at n=18A035878
- Numbers having four 5's in base 8.at n=20A043444
- A049031/2.at n=33A049032
- A triangle of numbers related to triangle A030527.at n=17A049374
- Denominators of row 4 of table described in A051714/A051715.at n=22A051723
- Numbers k such that 297*2^k + 1 is prime.at n=23A053365
- First differences of A069475, successive differences of (n+1)^6-n^6.at n=30A069476
- Product of prime(n+1)-1 and prime(n)-1.at n=35A083553
- (prime(n-1) + 1)*(prime(n+1) - 1).at n=34A087105
- Triangle read by rows: T(n,k) = number of functions from [1,2,...,n] to [1,2,...,n] such that the image contains exactly k elements (0<=k<=n).at n=25A090657
- Molien series for symmetrized weight enumerators of self-dual codes over GF(4) + GF(4)u with u^2 = 0.at n=45A092549
- Engel expansion of Mertens's constant (A077761).at n=10A096167
- Triangle read by rows: T(n,h) = number of functions f:{1,2,...,n}->{1,2,...,n} such that |Image(f)|=h; h=1,2,...,n, n=1,2,3,... . Essentially A090657, but without zeros.at n=18A101817
- a(n) = 4*n^3 + 4*n.at n=18A105374
- Number of orbits of the 5-step recursion mod n.at n=15A106287