Hexagonal spiral constructed on the nodes of the triangular net in which each new term is the sum of its neighbors.

A278181

Hexagonal spiral constructed on the nodes of the triangular net in which each new term is the sum of its neighbors.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =7a(7) =8a(8) =9a(9) =12a(10) =14a(11) =19a(12) =22a(13) =29a(14) =33a(15) =42a(16) =47a(17) =59a(18) =74a(19) =82a(20) =99a(21) =108a(22) =129a(23) =155a(24) =169a(25) =202a(26) =243a(27) =265a(28) =316a(29) =378

External references