A061655 The number 2 (that is, 1+1) in the Witt vector ring for p=2 over the integers.

2, -1, -4, -40, -4960, -147166720, -299211527038566400, -2703337074029927682081937523621232640

Offset: 0

Author

David A. Madore, Jun 15 2001

Keywords

• sign

Examples

			a(0)^4 + 2*a(1)^2 + 4*a(2) = 2^4 + 2*(-1)^2 + 4*(-4) = 16+2-16 = 2.
		

References

• Jean-Pierre Serre, Local Fields (Corps Locaux), chapter 2, paragraph 6

Crossrefs

Cf. A006173 and others.

Formula

Sum(2^j*a(j)^(2^(i-j)), j=0..i)=2 for all i.