A hexagonal spiral Fibonacci sequence.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =12a(6) =20a(7) =34a(8) =55a(9) =90a(10) =148a(11) =240a(12) =394a(13) =638a(14) =1043a(15) =1688a(16) =2750a(17) =4450a(18) =7232a(19) =11736a(20) =19002a(21) =30827a(22) =49884a(23) =80856a(24) =130978a(25) =211982a(26) =343348a(27) =555964a(28) =899706a(29) =1456702