a(n) is the numerator of the sum of the first n terms of 1 - 1/3 - 1/5 + 1/7 + 1/9 - 1/11 - 1/13 + ... .
A346781
a(n) is the numerator of the sum of the first n terms of 1 - 1/3 - 1/5 + 1/7 + 1/9 - 1/11 - 1/13 + ... .
Terms
- a(0) =1a(1) =2a(2) =7a(3) =64a(4) =227a(5) =2182a(6) =24901a(7) =27904a(8) =519413a(9) =9103082a(10) =8410247a(11) =207985216a(12) =1106853941a(13) =3134651098a(14) =85885292267a(17) =402260886146
External references
- oeis: A346781