37816

Appears in sequences

• Number of planar partitions of n, but partitions that are mirror images of each other (when regarded as 3-D objects) are counted only once.at n=19A048140
• Expansion of g.f.: x*(2 - 9*x - 4*x^2)/((1 - 5*x + x^2)*(1 - 5*x - x^2)).at n=7A106804
• Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k - gcd(m,k).at n=41A124141
• Numbers p of primitive Pythagorean triangles such that perimeters and products of 3 sides are Averages of twin prime pairs, q=p+1, a=q^2-p^2, c=q^2+p^2, b=2*p*q, ar=a*b/2; s=a+b+c, s-+1 are primes, pr=a*b*c, pr-+1 are primes.at n=3A155178
• Number of binary strings of length n with no substrings equal to 0001 0100 or 1101.at n=19A164467
• Numbers k such that k^2 + 1 = p*q, p and q primes and |p-q| is square.at n=44A187401
• Triangle read by rows: T(n,k) = number of Ringel ladders of order n and genus k.at n=34A298800
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.at n=8A305906