0,3

Diagonal sums of number triangle A124860.

a(n)=a(n-1)+3a(n-2)-4a(n-3)-2a(n-4); a(n)=sum{k=0..floor(n/2), J(n-k+1)C(n-k,k)} where J(n)=A001045(n).

Adjacent sequences: A124858 A124859 A124860 this_sequence A124862 A124863 A124864

Sequence in context: A027972 A002878 A098149 this_sequence A110579 A084378 A099065

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Nov 10 2006