Hexagonal spiral sequence: sequence is written as a hexagonal spiral around a 'dummy' center, each entry is the sum of the row in the previous direction containing the previous entry.
A063178
Hexagonal spiral sequence: sequence is written as a hexagonal spiral around a 'dummy' center, each entry is the sum of the row in the previous direction containing the previous entry.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =10a(7) =23a(8) =33a(9) =42a(10) =98a(11) =110a(12) =250a(13) =286a(14) =646a(15) =749a(16) =1681a(17) =1939a(18) =2059a(19) =6428a(20) =7097a(21) =15584a(22) =17556a(23) =19279a(24) =59516a(25) =66042a(26) =68211a(27) =213048a(28) =230854a(29) =246724
External references
- oeis: A063178