login
Triangle (read by rows) in which the number of entries in a row only increases by 1 every other row, the first column and the 'diagonal' is set to all 1's and a(i,j) = a(i-1,j) + a(i-1,j-1) + a(i-2,j-1) + a(i-3,j-1) for other entries.
0

%I #4 Mar 31 2012 14:11:11

%S 1,1,1,1,1,4,1,7,1,1,10,13,1,13,34,1,1,16,64,49,1,19,103,160,1,1,22,

%T 151,361,211,1,25,208,679,781,1,1,28,274,1141,1981,994,1,31,349,1774,

%U 4162,3967,1,1,34,433,2605,7756,10891,4963,1,37,526,3661,13276,24790,20815,1

%N Triangle (read by rows) in which the number of entries in a row only increases by 1 every other row, the first column and the 'diagonal' is set to all 1's and a(i,j) = a(i-1,j) + a(i-1,j-1) + a(i-2,j-1) + a(i-3,j-1) for other entries.

%C The 2nd column is A016777 (3n+1), the 3rd column is A081271 (Vertical of triangular spiral in A051682.)

%K nonn,tabf

%O 0,6

%A _Gerald McGarvey_, Aug 18 2004