Record values in A177942.

Terms

a(0) =3a(1) =7a(2) =13a(3) =37a(4) =79a(5) =163a(6) =349a(7) =757a(8) =1567a(9) =3163a(10) =6547a(11) =13099a(12) =26497a(13) =52999a(14) =106273a(15) =212557a(16) =426889a(17) =855427a(18) =1710853a(19) =3421903a(20) =6845869a(21) =13691767a(22) =27385087a(23) =54771007a(24) =109542907a(25) =219096259a(26) =438203677a(27) =876417229a(28) =1752875893a(29) =3505814527