A361258 Irregular triangle read by rows in which row n lists the print order of a 4n-page booklet.

2, 3, 4, 1, 2, 7, 8, 1, 4, 5, 6, 3, 2, 11, 12, 1, 4, 9, 10, 3, 6, 7, 8, 5, 2, 15, 16, 1, 4, 13, 14, 3, 6, 11, 12, 5, 8, 9, 10, 7, 2, 19, 20, 1, 4, 17, 18, 3, 6, 15, 16, 5, 8, 13, 14, 7, 10, 11, 12, 9, 2, 23, 24, 1, 4, 21, 22, 3, 6, 19, 20, 5, 8, 17, 18, 7, 10, 15, 16, 9, 12, 13, 14, 11

Offset: 1

Author

Ole Palnatoke Andersen, Mar 06 2023

Keywords

• nonn
• look
• tabf

Comments

Row n is a permutation of the first 4*n positive integers.

Examples

			Triangle begins:
  2,  3,  4, 1;
  2,  7,  8, 1, 4,  5,  6, 3;
  2, 11, 12, 1, 4,  9, 10, 3, 6,  7,  8, 5;
  2, 15, 16, 1, 4, 13, 14, 3, 6, 11, 12, 5, 8, 9, 10, 7;
  ...
		

Links

• Alois P. Heinz, Rows n = 1..100, flattened

Crossrefs

Cf. A008586 (row lengths), A033585 (row sums).

Programs

Maple

T:= n-> seq([2*m, 4*n-2*m+1, 4*n-2*m+2, 2*m-1][], m=1..n):
seq(T(n), n=1..6);  # Alois P. Heinz, Mar 06 2023