78720

Appears in sequences

• a(n) = Sum_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=2, a(2)=1, and a(3)=3.at n=13A024961
• Array read by antidiagonals: T(k,d) = number of different hyperplanes in d-space with integer coefficients in set {-k,...,-1,0,1,...,k}.at n=31A061559
• Number of binary strings of length n with no substrings equal to 0010 or 1011.at n=16A164404
• Numbers with prime factorization pqrs^7.at n=20A190473
• a(n) = n*(7*n^2 + 15*n + 8)/6.at n=40A245301
• a(n) is the position of the first term in A303762 that has prime(n) as one of its prime factors.at n=19A302774
• Numbers k such that k = Product (p_j^e_j) = Product (p_j*(e_j + 1)).at n=24A304410
• (1/5) times the sum of the elements of all subsets of [n] whose sum is divisible by five.at n=15A309297
• Numbers whose prime indices and prime signature have the same mean.at n=36A359903
• Numbers k such that k divides sigma(A003961(k)), where A003961 is fully multiplicative with a(p) = nextprime(p), and sigma is the sum of divisors function.at n=34A389469