Spiro-tetranacci numbers: a(n) = sum of four previous terms that are nearest when terms arranged in a spiral.
A092369
Spiro-tetranacci numbers: a(n) = sum of four previous terms that are nearest when terms arranged in a spiral.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =1a(4) =3a(5) =5a(6) =9a(7) =15a(8) =25a(9) =41a(10) =68a(11) =111a(12) =181a(13) =294a(14) =299a(15) =597a(16) =900a(17) =1505a(18) =1522a(19) =3041a(20) =4577a(21) =7642a(22) =7691a(23) =7772a(24) =15529a(25) =23367a(26) =39005a(27) =39225a(28) =39585a(29) =79102
External references
- oeis: A092369