Best-known CA bounds for t=2, v=21

kNBestVerifiedMethods
2441441✓Trivial
4882441✓Product
81323480✓Product
161764512✓Product
322205680✓Product
642646902✓Product
1283087902✓Product
2563528965✓Product
5123969979✓Product
102444101282✓Product
204848511363✓Product
409652921390✓Product
819257331436✓Product
1638461741490✓Product
2000066151609✓Product