28720

Appears in sequences

• Quotients arising in A073162: A046992(n)/n if n is in A073162.at n=6A073164
• Column 1 of triangle A118032, where column 1 of the matrix square of A118032 forms a bisection of this sequence.at n=19A118034
• Column 1 of triangle A118045; also equals a bisection of A118034, which is column 1 of A118032.at n=9A118047
• a(n) = 2*n*(9*n-1).at n=39A178574
• Somos's sequence {b(8,n)} defined in comment in A078495: a(0)=a(1)=...=a(18)=1; for n>=19, a(n)=(a(n-1)*a(n-18)+a(n-9)*a(n-10))/a(n-19).at n=45A271955
• Sum of quadratic residues of (n-th prime == 3 mod 4).at n=36A282035
• Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p.at n=17A282041
• Irregular triangle read by rows: T(n,k) is the number of simple connected graphs on n unlabeled nodes with domination number k, n >= 1, 1 <= k <= A065033(n+1).at n=19A332401