A048201 - OEIS

%I #8 Mar 30 2012 18:56:54

%S 1,2,3,4,6,7,5,9,11,12,8,13,17,19,20,10,18,23,27,29,30,14,24,32,37,41,

%T 43,44,15,29,39,47,52,56,58,59,16,31,45,55,63,68,72,74,75,21,37,52,66,

%U 76,84,89,93,95,96,22,43,59,74,88,98,106,111

%N Triangular array T read by rows: T(i,j)=b(i+1)-b(i+1-j); j=1,2,...,i; i=1,2,3,...; b=A004978.

%F T(n, 1)=least number not in any preceding row and T(n, k)=T(n, 1)+T(n-1, 1)+...+T(n-k+1, 1) for k >= 2.

%e Rows: {1}, {2,3},{4,6,7}, ...

%Y T(n, 1)=c(n), where c=A002048.

%Y T(n, n)=d(n), where d=A002049.

%K nonn,tabl

%O 1,2

%A _Clark Kimberling_