|
| |
|
|
A127715
|
|
Right-most border of triangle A127714: a(n) = A127714(n, (n+1)*(n+2)/2 - 1).
|
|
10
| |
|
|
1, 1, 3, 14, 86, 645, 5662, 56632, 633545, 7820115, 105401961, 1538517351, 24157841308, 405778641302, 7256711524298, 137607733327779, 2757147167433326, 58188668578629283, 1289965088962987961
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
LINKS
| Paul D. Hanna, Table of n, a(n), n=0..100.
|
|
|
FORMULA
| a(n) = upper left term of M^n, M = an infinite square production matrix in which nonzero terms = A033184 with the first "1" deleted, as follows:
1, 1, 0, 0, 0, 0,...
2, 2, 1, 0, 0, 0,...
5, 5, 3, 1, 0, 0,...
14, 14, 9, 4, 1, 0,...
42, 42, 28, 14, 5, 1,...
... - Gary W. Adamson, Aug 02 2011
|
|
|
EXAMPLE
| a(4) 3 = 14 = the upper left term of M^3
|
|
|
CROSSREFS
| Cf. A127714, A127716.
Cf. A033184
Sequence in context: A088716 A005189 A074520 * A087912 A051818 A091102
Adjacent sequences: A127712 A127713 A127714 * A127716 A127717 A127718
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Jan 24 2007
|
| |
|
|
