-181

Appears in sequences

• Expansion of Product_{n>=1} (1 - x^n)^7.at n=35A000730
• a(n) = -a(n-1) - 2*a(n-2).at n=26A001607
• a(n) = a(n-1) - 2*a(n-2) with a(0) = 2, a(1) = 1.at n=13A002249
• Expansion of e.g.f.: cos(x*cos(x)) (even powers only).at n=3A009015
• Expansion of e.g.f. cos(x/cos(x)) (even powers only).at n=3A009118
• Expansion of log(1+sinh(x))/cosh(x).at n=6A009355
• Signed distance of primes from LCM(1,...,x) being closest to it. Arguments x were selected from A000961 (powers of primes including primes) in order to use distinct values of LCM exactly once. When both closest primes are in the same distance, then negative were used.at n=52A058030
• a(n) = mu(n)*prime(n).at n=41A062007
• a(n) = + 1 - 2 - 3 + 4 + 5 + 6 - 7 - 8 - 9 - 10 + 11 + 12 + 13 + 14 + 15 - ... + (+-1)*n, where there is one plus, two minuses, three pluses, etc. (see A002024).at n=52A064520
• a(n) = prime(n)-n*tau(n) where tau(n) is the number of divisors of n.at n=53A067292
• Determinant of rank n matrix of 1..n^2 filled successively along antidiagonals.at n=18A069480
• Determinant of the n X n matrix whose element (i,j) equals |i-j| (Mod 3).at n=61A071768
• a(n) = -2*a(n-1) + 3*a(n-2), with a(0)=1, a(1)=2.at n=6A084222
• G.f.: -(1-3*x^2-x^3)/(1+4*x-4*x^3-x^4).at n=4A097948
• Diagonal sums of the Fibonacci related number triangle A110314.at n=26A110315
• Row sums of a number triangle related to the Pell numbers.at n=13A110331
• Diagonal sums of number a triangle related to the Pell numbers.at n=26A110332
• McKay-Thompson series of class 36e for the Monster group.at n=41A112175
• a(n,m) =Floor[N[(-2 + Sqrt[3])^n + (-2 - Sqrt[3])^n]/2^m].at n=11A117809
• Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1).at n=41A129396