A294848 a(n) is the total number of horizontal line segments in the diagram of the symmetries of sigma described in A236104 after n-th stage, with a(0) = 1.

1, 2, 3, 4, 6, 7, 10, 11, 14, 16, 19, 20, 24, 25, 28, 32, 37, 38, 43, 44, 49, 53, 56, 57, 63, 66, 69, 73, 80, 81

Offset

0,2

Comments

Since the diagram is symmetrics a(n) is also the number of vertical line segments after n-th stage. For a diagram see A294847.

Links

Table of n, a(n) for n=0..29.

Formula

a(n) = A294847(n)/2.

Crossrefs

Cf. A196020, A235791, A236104, A236106, A237591, A237593, A245092, A293750, A294847, A294849.

Sequence in context: A120440 A284384 A049995 * A055802 A114220 A134519

Adjacent sequences: A294845 A294846 A294847 * A294849 A294850 A294851

Keyword

nonn,more

Author

Omar E. Pol, Nov 09 2017

Status

approved