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

0,1

References

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

Links

Table of n, a(n) for n=0..7.

Formula

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

Example

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

Crossrefs

Cf. A006173 and others.

Sequence in context: A025506 A174941 A267381 * A009830 A053374 A355517

Adjacent sequences: A061652 A061653 A061654 * A061656 A061657 A061658

Keyword

sign

Author

David A. Madore, Jun 15 2001

Status

approved