OFFSET
0,2
COMMENTS
1, 1/2, 5/12, 9/24, 251/720, 475/1440,...
5/12, 1/24, 11/720, 11/1440,...
-9/24, -19/720, -11/1440,...
251/720, 27/1440,...
-475/1440,... etc.
This is an autosequence of the second kind: its inverse binomial transform is the signed sequence with the main diagonal double of the first upper diagonal.
a(n) is the denominators written by antidiagonals.
REFERENCES
P. Curtz, Intégration numérique des systèmes différentiels à conditions initiales. Centre de Calcul Scientifique de l'Armement, Arcueil 1969. Pages 36 and 56.
FORMULA
Repeat n+1 times A091137(n). Triangle.
EXAMPLE
1,
2, 2,
12, 12, 12,
24, 24, 24, 24, etc.
CROSSREFS
KEYWORD
AUTHOR
Paul Curtz, Dec 01 2013
STATUS
approved