OFFSET
1,4
COMMENTS
Alternate diagonal sums give A008619.
Diagonals sums give A097076. - Philippe Deléham, Oct 13 2013
FORMULA
Excel formula: C6=2*C4+C5+B5+B4 with C5=a(1)=1 and C6=a(2)
T(n,k) = T(n-1,k) + T(n-1,k-1) + 2*T(n-2,k) + T(n-2,k-1). - Philippe Deléham, Oct 13 2013
EXAMPLE
1
1,1
3,3,1
5,9,5,1
11,23,19,7,1
21,57,61,33,9,1
Pascal-like triangle based on a right-triangular sum (with the top multiplied by 2): For n=13 a(13)=2*a(3)+a(5)+a(8)+a(9)= 2+3+9+5=19.
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Mark Dols, Sep 03 2009, Sep 06 2009
STATUS
approved