19598

Appears in sequences

• Number of 2's in all partitions of n.at n=32A024786
• Numbers k such that numerator(Bernoulli(2*k)/(2*k)) is different from numerator(Bernoulli(2*k)/(2*k*(2*k-1))).at n=75A090495
• Let p(k) be the number of partitions of k (A000041); a(n) = Sum_{1<=k<=n, gcd(k,n)=1} p(k).at n=31A096223
• Number of base 10 n-digit numbers with adjacent digits differing by two or less.at n=6A126397
• Number of n X 3 1..2 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nonincreasing order.at n=46A166830
• a(n) = Sum_{d|n} (-1)^(n/d+1)*d^4.at n=11A284900
• Ulam numbers k such that 4*k and 16*k are also Ulam numbers.at n=28A287634
• Numbers of the form 2*t^2-4 when t > 1 is a term in A001541.at n=2A349766
• a(n) is the smallest k such that A363533(k) = n, or -1 if no such k exists.at n=37A363536
• Expansion of 1/(1 - 4*x^3/(1-x))^(3/2).at n=15A377213
• Even numbers m such that the sum of the squares of the odd divisors and the sum of the squares of even divisors of m are both squares.at n=4A380742