bibkey: oeis2026a001045
authors: The OEIS Foundation Inc.
year: 2026
title: "OEIS A001045: Jacobsthal numbers, revision 1350"
doi: null
url: https://oeis.org/A001045/internal
claim: "Offset-zero recurrence a(0)=0, a(1)=1, a(n)=a(n-1)+2*a(n-2)."
strata_touched:
  - D5/S3/ArithSums/HannaLaurentAlternatingJacobsthal
license: citation-only
triage: anchor

Offset-zero Jacobsthal numbers

The official A001045 record uses offset 0,4 and the recurrence a(0)=0, a(1)=1, a(n)=a(n-1)+2*a(n-2). The citation year identifies the qualified revision snapshot, rather than the origin of the classical sequence. The official export for revision 1350 has SHA256 980060586ee34bc89f0e7444460104d14682c4b905ea622ca7978ee876d01427.

Verified locator

• URL: https://oeis.org/A001045/internal