A210605 Bisection of Recamán's sequence A005132.

1, 6, 7, 20, 21, 22, 23, 24, 25, 62, 63, 18, 17, 16, 15, 14, 79, 78, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 224, 225, 226, 227, 228, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 265, 264, 263, 262, 261, 40, 265, 494, 495, 258, 259

Offset

1,2

Comments

Also length of the vertical edges of a rectangular polyspiral path. For the horizontal edges see A210604. The mentioned polyspiral path is one of the three views of a rectangular polyhelix which is a three-dimensional graphical representation of Recamán's sequence A005132.

Links

Table of n, a(n) for n=1..61.

Index entries for sequences related to Recamán's sequence

Example

1) Written as an irregular array in which each row lists consecutive numbers in ascending order or in descending order:
1;
6,7;
20,21,22,23,24,25;
62,63;
18,17,16,15,14;
79,78,77;
78,79,80,81,82,83,84,85,86,87,88,89,90,91;
...
2) Written as an irregular array in which each row lists consecutive numbers in ascending order, in descending order or in descending-ascending order:
1;
6,7;
20,21,22,23,24,25;
62,63;
18,17,16,15,14;
79,78,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91;
...

Crossrefs

Cf. A005132, A065056, A171175, A171178, A210604-A210607.

Sequence in context: A285819 A287760 A305675 * A175262 A345911 A081348

Adjacent sequences: A210602 A210603 A210604 * A210606 A210607 A210608

Keyword

nonn,tabf

Author

Omar E. Pol, Mar 23 2012

Status

approved