82251
domain: N
Appears in sequences
- Binomial coefficient binomial(n,4) = n*(n-1)*(n-2)*(n-3)/24.at n=39A000332
- Binomial coefficient C(3n,n-9).at n=4A004327
- 4-dimensional analog of centered polygonal numbers.at n=27A006325
- Number of intersections of diagonals in the interior of a regular n-gon.at n=38A006561
- Binomial coefficient C(39,n).at n=4A010955
- Binomial coefficient C(n,35).at n=4A010988
- T(n,4), array T as in A050186; a count of aperiodic binary words.at n=35A050189
- Binomial coefficients binomial(2*n-3,4).at n=17A053126
- Triangle read by rows: T(n,k) = binomial(t(n) - t(k-1),k), where t(j) = j*(j+1)/2; 1<=k<=n.at n=39A110770
- Triangle, read by rows, where T(n,k) = C( n*(n+1)/2 + n-k - 1, n-k), for n>=k>=0.at n=40A122178
- a(n) = A001512(n)/24 = (5*n+1)*(5*n+2)*(5*n+3)*(5*n+4)/24.at n=7A151989
- Sum of tetrahedral numbers A000292(k), with k in the reduced residue system modulo n.at n=36A189918
- Numbers n with property that n and 2n are sums of two distinct positive cubes.at n=21A191345
- a(n) = binomial(n, d(n)), where d(n) = A000005(n) is the number of divisors of n.at n=38A204292
- Second pentagonal numbers that are interprime.at n=29A205881
- Triangle where the g.f. of column k is 1/(1-x)^(k^2) for k>=1, as read by rows n>=1.at n=50A214398
- a(n) = 5*binomial(7*n+5,n)/(7*n+5).at n=5A233834
- a(n) = binomial(n+4,4)*gcd(n,5)/5.at n=35A234042
- The least nonsquarefree number on row n of Pascal's triangle, or 1 if all the terms on that row are squarefree.at n=39A249716
- 30-gonal pyramidal numbers: a(n) = n*(n+1)*(28*n-25)/6.at n=26A256650