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A063404 a(0)=1; a(1)=1; a(2)=1; a(n) = a(n-1) + (1 + a(n-2))*(1 + a(n-3)). 1
1, 1, 1, 5, 9, 21, 81, 301, 2105, 26869, 662881, 57251101, 17868890441, 37968593886405, 1023051637915653489, 678457667444617722784941, 38843832843299593293720040241881, 694097227974493731990570304927658701989461 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
MATHEMATICA
RecurrenceTable[{a[0]==a[1]==a[2]==1, a[n]==a[n-1]+(1+a[n-2])(1+ a[n-3])}, a, {n, 20}] (* Harvey P. Dale, Feb 27 2012 *)
PROG
(PARI) { a=a3=a2=a1=1; for (n = 0, 28, if (n>2, a=a1 + (1 + a2)*(1 + a3); a3=a2; a2=a1; a1=a); write("b063404.txt", n, " ", a) ) } \\ Harry J. Smith, Aug 20 2009
CROSSREFS
Sequence in context: A146932 A146476 A110200 * A102177 A299266 A219521
KEYWORD
nonn,easy
AUTHOR
Olivier Gérard, Jul 16 2001
EXTENSIONS
One additional term from Harvey P. Dale, Feb 27 2012
STATUS
approved

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Last modified June 12 23:09 EDT 2024. Contains 373360 sequences. (Running on oeis4.)