28911

Appears in sequences

• Crystal ball sequence for E_7 lattice.at n=3A008398
• Number of paths of length n in the first quadrant, starting at the origin and consisting of 2 kinds of upsteps U=(1,1) (U1 and U2), 3 kinds of flatsteps F=(1,0) (F1, F2 and F3) and 1 kind of downsteps D=(1,-1).at n=6A134425
• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=7.at n=35A143450
• Number of binary strings of length n with no substrings equal to 0001 0111 or 1010.at n=22A164483
• Numbers m such that sigma(m) = tau(m)! where sigma(k) = A000203(k) and tau(k) = A000005(k).at n=13A351866
• Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (x^n - 8*A(x))^n = 1 - 6*Sum_{n>=1} x^(n^2).at n=5A370038