1750320

Appears in sequences

• a(n) = (2n+3)! /( n! * (n+1)! ).at n=7A000911
• Triangle of coefficients of Legendre polynomials 2^n P_n (x).at n=38A008556
• a(n) = 9*(n+1)*binomial(n+2,9)/2.at n=8A027782
• a(n) = denominator of sum of reciprocals of the terms of the continued fraction for H(n) = Sum_{k=1..n} 1/k.at n=30A112287
• a(n) = n!*A001515(n-1) with a(0) = 1.at n=6A143990
• a(n) is the least number k for which A000005(k)/A222084(k) = n.at n=15A222086
• Lexicographically earliest sequence such that for any n>1, n=u*v, where u/v = a(n)/a(n-1) in reduced form.at n=17A260850
• a(n) = denominator of Sum_{k=2..A335138(n)} abs(A309229(n, k))/k.at n=30A335417
• T(n, k) = (n + k - 1)*(n + k)*binomial(2*n + 1, n - k + 1) with T(0, 0) = T(1, 0) = 1. Triangle read by rows, T(n, k) for 0 <= k <= n.at n=37A342313
• T(n, k) = (n + k - 1)*(n + k)*binomial(2*n + 1, n - k + 1) with T(0, 0) = T(1, 0) = 1. Triangle read by rows, T(n, k) for 0 <= k <= n.at n=38A342313
• A260850 sorted into increasing order and duplicates omitted.at n=19A370974
• Denominators of the partial alternating sums of the reciprocals of the sum of unitary divisors function (A034448).at n=31A379516