A153453 - OEIS

%I #15 Sep 20 2020 09:31:41

%S 0,3,6,10,16,21,25,30,34,39,43,47,51,56,63,69,78,88,97,107,113,122,

%T 131,141,153,164,174,185,195,206,213,224,235,247,261,274,286,299,311,

%U 324,332,344,356,369,384,398,411,425,438,452,461,474,487,501,517,532,546,561,575,590,597

%N a(n) = letters(n) + a(n-1); a(0) = 0 in Spanish.

%H Álvar Ibeas, <a href="/A153453/b153453.txt">Table of n, a(n) for n = 0..10000</a>

%Y Cf. A067278, A011762.

%K nonn,word

%O 0,2

%A _Rodolfo Kurchan_, Dec 26 2008

%E More terms from _Álvar Ibeas_, Sep 20 2020