OFFSET
1,2
FORMULA
For n > 1, a(n) = A061761(n-1). - David Wasserman, Jun 03 2004
EXAMPLE
The triangle pertaining to n = 4 is obtained from the solid triangle
1
1 1
1 2 1
1 3 3 1
giving
1
1 1
1 1
1 3 3 1
and the sum of all the numbers is 13, so a(4) = 13.
MAPLE
restart:a:= proc(n) option remember; if n=0 then 1 else add((binomial (n, j)+2), j=0..n-1) fi end: seq (a(n), n=0..31); # Zerinvary Lajos, Mar 29 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Mar 25 2003
EXTENSIONS
Corrected and extended by David Wasserman, Jun 03 2004
STATUS
approved