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A127715 Rightmost 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; text; 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: M =

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(3) = 14 = the upper left term of M^3.

CROSSREFS

Cf. A127714, A127716, A033184

Sequence in context: A308940 A276313 A074520 * A307440 A087912 A308878

Adjacent sequences:  A127712 A127713 A127714 * A127716 A127717 A127718

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 24 2007

STATUS

approved

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Last modified June 19 23:18 EDT 2021. Contains 345153 sequences. (Running on oeis4.)