19164

Appears in sequences

• Fibonacci sequence beginning 0, 12.at n=17A022346
• a(n) = floor ( n(n+1)(n+2)(n+3) / (n+(n+1)+(n+2)+(n+3)) ).at n=41A032767
• Acyclic orientations of Hamming graph (K_n) x (K_n).at n=2A053870
• Number of acyclic orientations of the Hamming graph (K_3) x (K_n).at n=3A054653
• Number of polyhexes with n cells that do not tile the plane.at n=9A070767
• Numbers n such that if p=prime(n), then p, p+6, p+12, p+18 are consecutive primes with p=6*k+5 for some k, where prime(n) denotes n-th prime.at n=31A090835
• An INVERT transform of the Thue-Morse sequence.at n=18A144026
• Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 2.at n=36A209984
• Numbers that form a Pythagorean 6-tuple with their first four arithmetic derivatives.at n=0A249106
• Number of multisets of nonempty words with a total of n letters over septenary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.at n=10A293737
• a(n) = 9*n^2 + 21*n - 6 (n>=1).at n=44A304374
• a(n) is the number of multiplications required to compute the permanent of general n X n matrices using trellis method with normalization.at n=11A348864
• The number of squarefree abundant numbers whose largest prime divisor is prime(n).at n=15A354951