-195

Appears in sequences

• Generalized sum of divisors function.at n=16A002130
• Coefficients of modular function G_4(tau).at n=9A005762
• Expansion of e.g.f. sinh(log(1+x))*cos(x).at n=6A009572
• Expansion of tan(log(1+x)*cos(x)).at n=6A009649
• Expansion of e.g.f.: arcsin(sech(x)*log(x+1))=x-1/2!*x^2-6/4!*x^4+43/5!*x^5-195/6!*x^6...at n=6A012872
• Coefficients of the '6th-order' mock theta function phi(q).at n=43A053268
• n - reversal of hexadecimal (base 16) digits of n (written in base 10).at n=30A055965
• n - reversal of hexadecimal (base 16) digits of n (written in base 10).at n=47A055965
• Triangle of generalized sum of divisors function, read by rows.at n=63A060044
• A measure of how close the square root of 2 is to rational numbers.at n=30A068515
• a(1) = 1, a(2n) = a(2n-1) + c(n) and a(2n+1) = a(2n) - p(n), where c(n)=A002808(n) and p(n)=A000040(n) are the n-th composite and n-th prime numbers, respectively.at n=36A073891
• Expansion of (1-x)^(-1)/(1 + x - x^2 + 2*x^3).at n=9A077903
• Expansion of (1-x)^(-1)/(1+2*x-x^2-x^3).at n=7A077920
• Determinant of the n X n tridiagonal matrix M with the elements on the diagonals equal to 1, except M(n,n-1)=M(n-1,n)=n.at n=12A080322
• Consider the triangle in which the n-th row starts with n, contains n terms and the difference of successive terms is 1,2,3,... up to n-1. Sequence gives row sums.at n=12A081498
• First order recursion: a(0) = 1; a(n) = phi(n) - a(n-1) = A000010(n) - a(n-1).at n=46A083239
• a(n) = -a(n-2) + 2*a(n-4) - a(n-10).at n=17A089135
• Dirichlet inverse of the gcd-sum function (A018804).at n=41A101035
• a(n+3) = 2a(n+2) - 3a(n+1) + 2a(n); a(0) = 1, a(1) = 3, a(2) = 4.at n=21A105579
• Row sums of number triangle A106270.at n=6A106271