2227680

Appears in sequences

• Product of first n nonzero Fibonacci numbers F(1), ..., F(n).at n=9A003266
• a(n) = denominator of Bernoulli(2n)/(2n).at n=23A006953
• Triangle read by rows. A generalization of unsigned Lah numbers, called L[4,1].at n=51A048854
• Denominators from e.g.f. 1/(1-exp(-x)) - 1/x.at n=47A075180
• Number of arrangements of n labeled balls in n labeled columns where only 1 column may have more than 1 ball.at n=6A086984
• Triangle, read by rows: T(0,0) = 1, T(n,k) = F(n+1)*T(n-1,k) - T(n-1,k-1) where F(n+1) is the (n+1)st Fibonacci number.at n=36A107416
• Triangle T(n,k), 1<=k<=n, read by rows given by T(n,k) = A003266(n)/A000045(k).at n=36A121284
• Triangle T(n,k), 1<=k<=n, read by rows given by T(n,k) = A003266(n)/A000045(k).at n=37A121284
• Triangle where g.f. of row n = Product_{i=0..n} [F(i+1) + F(i)*x] for n>=0, where F(i) = A000045(i) is the i-th Fibonacci number.at n=36A130405
• a(n) = denominator of Sum_{k=1..n} k^mu(n+1-k), where mu(m) = A008683(m).at n=35A130492
• A triangle of recursive Fibonacci Lah numbers: f(n) = Fibonacci(n)*f(n - 1), L(n, k) = binomial(n-1, k-1)*(f(n)/f(k)).at n=36A137478
• A partition product of Stirling_1 type [parameter k = -5] with biggest-part statistic (triangle read by rows).at n=30A157385
• n*A027642(n).at n=48A164869
• First bisection of A164869.at n=24A164877
• For odd n, a(n) = 2; for even n, a(n) = denominator of Bernoulli(n)/n; The number 2 alternating with the elements of A006953.at n=47A185633
• Augmentation of the Fibonacci triangle A058071. See Comments.at n=36A193595
• Triangle T(n,k) giving denominator of integral_{x=0..1} B(n,x)*B(k,x) dx, B = Bernoulli polynomial, n >= 1, 1 <= k <= n.at n=59A225750
• Indices k of records of low value in the ratios A319696(k)/A000005(k) between the number of distinct values of the Euler totient function applied to the divisors of k and the number of divisors of k.at n=19A328859
• Integers whose number of normal undulating divisors sets a new record.at n=37A355304
• Denominators of the partial sums of the reciprocals of the sum of unitary divisors function (A034448).at n=24A379514