Spiro-tribonacci numbers: a(n) = sum of three previous terms that are nearest when terms arranged in a spiral.
A092360
Spiro-tribonacci numbers: a(n) = sum of three previous terms that are nearest when terms arranged in a spiral.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =3a(4) =5a(5) =8a(6) =13a(7) =14a(8) =28a(9) =43a(10) =45a(11) =89a(12) =135a(13) =138a(14) =143a(15) =284a(16) =430a(17) =438a(18) =451a(19) =897a(20) =1356a(21) =1404a(22) =1446a(23) =2878a(24) =4352a(25) =4423a(26) =4511a(27) =4645a(28) =9245a(29) =13979
External references
- oeis: A092360