-2207
domain: Z
Appears in sequences
- Expansion of log(1+sin(tanh(x))).at n=9A009330
- arctanh(sin(tanh(x)))=x-1/3!*x^3+1/5!*x^5+55/7!*x^7-2207/9!*x^9...at n=4A012048
- Expansion of (1-2*x)/(1+x-x^2).at n=15A075193
- Sum of Lucas numbers and inverted Lucas numbers: a(n) = A000032(n)*A075193(n).at n=17A075270
- Expansion of (1 - x)*(1 + x)^2*(1 + x^2)*(1 - x^2 + 2*x^3 + x^4) / ((1 - x^2 - x^4)*(1 + x^2 + 2*x^4 - x^6 + x^8)).at n=32A107363
- a(n)=1-4*n-4*n^2.at n=23A184882
- First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 129", based on the 5-celled von Neumann neighborhood.at n=29A270220
- First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 261", based on the 5-celled von Neumann neighborhood.at n=23A271064
- First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 337", based on the 5-celled von Neumann neighborhood.at n=25A271288
- a(n) = Sum_{k=1..n} (-2)^(n - floor(n/k)).at n=9A345109