186480

Appears in sequences

• a(n) = 4^n - C(4,3)*3^n + C(4,2)*2^n - C(4,1).at n=8A000919
• Triangle of numbers T(n,k) = k!*Stirling2(n,k) read by rows (n >= 1, 1 <= k <= n).at n=39A019538
• a(n) = n^2*(n+1)*(3*n^2 + 7*n - 2)*(n+5)!/11520.at n=4A037963
• Denominators of continued fraction convergents to sqrt(884).at n=15A042709
• Number of primitive (aperiodic) words of length n which contain exactly four different symbols.at n=8A056269
• Palindromes using exactly four different symbols.at n=16A056455
• Palindromes using exactly four different symbols.at n=17A056455
• Number of primitive (aperiodic) palindromes using exactly four different symbols.at n=16A056465
• Number of periodic palindromes using exactly four different symbols.at n=16A056490
• Number of primitive (period n) periodic palindromes using exactly four different symbols.at n=16A056500
• Numbers n such that phi(sigma(n)) = 5*phi(n).at n=28A067708
• Numbers k such that (k-1, k+1) and (k/2-1, k/2+1) are both pairs of twin primes.at n=28A076504
• T(n, k) = Sum_{j=0..n-k} (-1)^j*binomial(n - k + 1, j)*(n - k + 1 - j)^n. Triangle read by rows, T(n, k) for 1 <= k <= n.at n=41A090582
• Triangle read by rows, related to A055129 (repunits in base k).at n=43A107893
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+16807)^2 = y^2.at n=18A118576
• Triangle of numbers T(n,k) = k!*Stirling2(n,k) = A000142(k)*A048993(n,k) read by rows, T(n, k) for 0 <= k <= n.at n=49A131689
• G.f.: Sum_{n>=0} (n+x)^n * x^n / (1 + n*x + x^2)^n.at n=8A187742
• Numbers with prime factorization pqrs^2t^4.at n=23A190384
• Number of closed paths of length n whose steps are 12th roots of unity, U_12(n).at n=7A198808
• Imaginary part of (n + i)^4.at n=36A272871