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A169952
Second entry in row n of triangle in A169950.
2
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)
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
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