156900

Appears in sequences

• a(n) = T(n, n-2), where T is given by A026519. Also number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 2.at n=14A026522
• a(n) = T(n,n-2), T given by A026536. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 2.at n=14A026539
• a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026519.at n=6A027264
• a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026536.at n=7A027269
• Numbers n such that n*((2^61-1)^3) - 1 and n*((2^61-1)^3) + 1 are twin primes.at n=10A099230
• Numbers n such that n is the average of four consecutive primes n-13, n-1, n+1 and n+13.at n=21A260959
• Number of words of length n, over the alphabet {a,b,c}, which have an odd number of a's and the number of b's plus the number of c's is less than or equal to 3.at n=50A342159
• E.g.f. satisfies A(x) = 1/(1 - x * exp(x*A(x)))^4.at n=5A377551