OFFSET
1,2
FORMULA
a(n) = A317390(n,n).
EXAMPLE
a(1) = 1: 1.
a(2) = 29: 1 + 2 * (1 + 13) = 1 + 7 * (1 + 3) = 29.
a(3) = 91: 1 + 2 * (1 + 11 * (1 + 3)) = 1 + 3 * (1 + 29) = 1 + 5 * (1 + 17) = 91.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 30 2018
STATUS
approved