|
|
A074703
|
|
a(n) = n^2*a(n-1)+1, a(1)=0.
|
|
1
|
|
|
0, 1, 10, 161, 4026, 144937, 7101914, 454522497, 36816322258, 3681632225801, 445477499321922, 64148759902356769, 10841140423498293962, 2124863523005665616553, 478094292676274763724426
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
LINKS
|
|
|
FORMULA
|
a(n) = round(n!^2*(BesselI(0, 2)-2)).
|
|
MATHEMATICA
|
nxt[{n_, a_}]:={n+1, (n+1)^2 a+1}; Transpose[NestList[nxt, {1, 0}, 20]][[2]] (* Harvey P. Dale, Dec 11 2013 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|