20554

Appears in sequences

• a(1)=1, a(n)=n*17^(n-1)+a(n-1).at n=3A014934
• Sum of a(n) terms of 1/k^(4/5) first exceeds n.at n=32A056180
• a(n) = 1 + 2*n + 3*n^2 + 4*n^3.at n=17A056578
• The least k such that A063994(k) = Product_{primes p dividing k} gcd(p-1, k-1) = n, or 0 if there's no such k.at n=50A064234
• Quotient cycle length in continued fraction expansion of sqrt(1+n^n).at n=10A077097
• Number of compositions into a prime number of distinct parts.at n=29A102623
• Pentanacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5), starting 1,0,0,0,1.at n=19A124313
• a(n) = 225*n^2 - 199*n + 44.at n=10A156812
• Triangle read by rows: T(n,k) is the number of Dyck paths with no UUU's and no DDD's, of semilength n and having k UUDUDD's starting at level 0 (0 <= k <= floor(n/3); U=(1,1), D=(1,-1)).at n=40A166295
• Number of Dyck paths of semilength n with no UUU's and no DDD's and having no UUDUDD's starting at level 0 (U=(1,1), D=(1,-1)).at n=14A166296
• Number of (n+1)X(n+1) 0..3 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.at n=3A187527
• T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.at n=18A187528
• Number of 5X5 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.at n=2A187531
• G.f.: 1 / Product_{i>=1} (1-q^(2*i-1))^2*(1-q^(12*i-8))*(1-q^(12*i-6))*(1-q^(12*i-4))*(1-q^(12*i)).at n=27A201077
• Number of partitions of n such that (greatest part) - (least part) >= number of parts.at n=40A237834
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 118", based on the 5-celled von Neumann neighborhood.at n=37A270187
• Numbers k such that the product of the first k prime gaps minus 1 is prime.at n=29A389714