OFFSET
1,2
COMMENTS
A061047(n) is divisible by 10 iff n is 3 or 7 mod 10. In this case, A061047(n) is also divisible by 40. - Andrew Howroyd, Jan 03 2020
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = A061047(5*n + 3 - (n mod 2)). - Andrew Howroyd, Jan 03 2020
PROG
(PARI) a(n)={my(t=5*n + 3 - n%2); numerator(1/49 - 1/t^2)/40} \\ Andrew Howroyd, Jan 03 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Curtz, Nov 03 2008
EXTENSIONS
Offset corrected and terms a(11) and beyond from Andrew Howroyd, Jan 03 2020
STATUS
approved