A169952 Second entry in row n of triangle in A169950.

1, 2, 5, 8, 13, 20, 33, 48, 75, 100, 145, 204, 293, 396, 559, 746, 1027, 1340, 1809, 2342, 3177, 4050, 5369, 6920, 9013, 11360, 14837, 18718, 24081, 29952, 38219, 47662, 60549, 74618, 93847, 115960, 145319, 177548, 221675, 270334, 335123, 406290, 500915

Offset

1,2

Comments

Wanted: a recurrence. Are any of A169940-A169954 related to any other entries in the OEIS?

Links

Fausto A. C. Cariboni, Table of n, a(n) for n = 1..99 (terms 1..64 from Andrew Howroyd)

Index entries for sequences related to carryless arithmetic

Formula

a(n) = A169947(n) - A169947(n-1) for n>1. - Andrew Howroyd, Jul 09 2017

Mathematica

A169947 = Import["https://oeis.org/A169947/b169947.txt", "Table"][[All, 2]];
Join[{1}, Differences[A169947]] (* Jean-François Alcover, Sep 02 2019 *)

Crossrefs

Related to thickness: A169940-A169954, A061909.

Sequence in context: A025216 A076059 A299732 * A025279 A169954 A015724

Adjacent sequences: A169949 A169950 A169951 * A169953 A169954 A169955

Keyword

nonn

Author

N. J. A. Sloane, Aug 01 2010

Extensions

a(16)-a(29) from Nathaniel Johnston, Nov 15 2010

Terms a(30) and beyond from Andrew Howroyd, Jul 09 2017

Status

approved