-338

Appears in sequences

• a(n) = Sum_{t=0..n} g(t)*g(n-t) where g(t) = A002121(t).at n=26A002122
• Expansion of sin(log(1+x))/cos(x).at n=7A009459
• E.g.f. sin(sin(x)*exp(x)).at n=6A009483
• 10th differences of primes.at n=6A036271
• a(n) = Sum_{k=0..floor(n/2)} binomial(n - k*(k-1)/2, k).at n=15A064188
• Inverse of binomial transform of Whitney triangle.at n=32A097761
• a(n) = sum( (-1)^(r+1)*(n-r)*r, r = 1..floor(n/2) ).at n=51A110422
• Expansion of psi(q^5)/psi(q) in powers of q where psi() is a Ramanujan theta function.at n=27A116494
• Triangular array read by rows: row n gives coefficients of p(n)(x), where p(0)=1, p(1)=x-1, p(n) = (x-fibonacci(n))*p(n-1)-(n-1)*p(n-2).at n=24A122838
• For n >= 2, n = Sum_{n/2<=k<=n, gcd(k,n)=1} a(k).at n=61A124406
• Expansion of eta(q) * eta(q^10)^3 / (eta(q^2) * eta(q^4) * eta(q^5) * eta(q^20)) in powers of q.at n=55A147702
• The main diagonal of the successive differences of A154127.at n=11A154570
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j)=max(ceiling(i/j),ceiling(j/i)) (as in A204143).at n=22A204144
• Expansion of 1 / (1 - x^5 - x^8 + x^9) in powers of x.at n=60A257543
• Triangle read by rows: row n gives coefficients in an expansion of M_n*M_{-n}, where M_n = x^n+y^n+z^n and x,y,z satisfy x+y+z=0.at n=50A259107
• Triangle read by rows: row n gives coefficients in an expansion of M_n*M_{-n}, where M_n = x^n+y^n+z^n and x,y,z satisfy x+y+z=0.at n=53A259107
• Triangle read by rows, inverse Bell transform of Bell numbers.at n=37A264429
• Row sums of triangle A274659.at n=27A273166
• n-th prime minus its ternary (base 3) reversal.at n=54A309574
• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^2.at n=19A321558