-1869
domain: Z
Appears in sequences
- tanh(sec(x)*arctanh(x))=x+3/3!*x^3-15/5!*x^5-1869/7!*x^7-88959/9!*x^9...at n=3A012848
- a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 1,1,-2,-1.at n=21A111571
- Expansion of (1-4x)/(1-x^2+x^3).at n=25A117379
- a(n) = Fibonacci(n-1)^2 - Fibonacci(n)^2.at n=9A121646
- Row sums of triangle A161363.at n=26A161375
- A triangle sequence from coefficients of an infinite sum polynomial: p(x,n)=Sum[(n - k - 1)^n*Binomial[x, k], {k, 0, Infinity}]/2^(x - n).at n=33A176863
- Determinant of the n X n matrix with (i,j)-entry equal to A008683(i+j-1) for all i,j = 1..n.at n=15A228548