A271493 Arises in enumeration of locally convex functions.

1, 2, 4, 8, 14, 24, 40, 66, 106, 170, 270, 426, 668, 1044, 1626, 2526, 3914, 6054, 9352, 14428, 22236, 34244, 52704, 81070, 12465, 191594, 294410, 452298, 694734, 1066968, 1638456

Offset

1,2

Comments

See Coscia-DeWitt (2016) for precise definition.

Links

Table of n, a(n) for n=1..31.

Christopher Coscia, Jonathan DeWitt, Locally Convex Words and Permutations, Electronic Journal of Combinatorics. 23 (2), 2016, #P2.10. Eq. 4.5 gives a g.f.

Crossrefs

Cf. A271491, A271492.

Sequence in context: A208605 A123655 A084683 * A118544 A222037 A019274

Adjacent sequences: A271490 A271491 A271492 * A271494 A271495 A271496

Keyword

nonn

Author

N. J. A. Sloane, Apr 15 2016

Extensions

More terms added by Christopher Coscia, May 30 2017

Status

approved