287980

Appears in sequences

• Values of C(n,3) which can be written as C(x,3) + C(y,3).at n=7A034404
• Length of period of continued fraction expansion of square root of 3^n+1.at n=23A062328
• Number of ways to choose three points in an (n X n)-grid (or geoplane).at n=10A178208
• Number of (w,x,y,z) with all terms in {1,...,n} and w <= x > y <= z.at n=34A212246
• Quarter-square tetrahedrals: a(n) = k*(k - 1)*(k - 2)/6, k = A002620(n).at n=22A217482
• a(n) = (32*n^3 - 2*n)/3.at n=30A267031
• a(n) = Product_{d|n, d>1} prime(1+(d mod 8)).at n=23A320108
• Triangle read by rows, T(n,k) = (binomial(n,k)^3 - binomial(n,k))/6 for k=1..n-1 and n >= 2.at n=38A373101
• Triangle read by rows, T(n,k) = (binomial(n,k)^3 - binomial(n,k))/6 for k=1..n-1 and n >= 2.at n=42A373101