OFFSET
0,2
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..460
FORMULA
a(n) ~ n! * (d*(1-(-1)^n) + 1+(-1)^n)*c/2 * d^n * n^2, where d = 0.8218983778054251105765881248... = 1/(r*sqrt(2)), where r is the root of the equation cot(r)=r and c = 0.986093542875063325007949... . - Vaclav Kotesovec, Jun 21 2015, updated Mar 16 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jun 21 2015
STATUS
approved