Search: id:A015219
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%I A015219
%S A015219 1,35,165,455,969,1771,2925,4495,6545,9139,12341,16215,20825,26235,
%T A015219 32509,39711,47905,57155,67525,79079,91881,105995,121485,138415,156849,
%U A015219 176851,198485,221815,246905,273819,302621,333375,366145,400995,437989
%N A015219 Odd tetrahedral numbers.
%C A015219 Sum_{n>=0} 1/a(n) = (3/2)*log(2) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), 
               Oct 20 2009]
%F A015219 (4n+1)(4n+2)(4n+3) / 6.
%F A015219 G.f.: (1+x)*(1+30*x+x^2)/(1-x)^4 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), 
               Oct 20 2009]
%Y A015219 Cf. A000292.
%Y A015219 Sequence in context: A005339 A045614 A154074 this_sequence A033851 A101954 
               A005937
%Y A015219 Adjacent sequences: A015216 A015217 A015218 this_sequence A015220 A015221 
               A015222
%K A015219 nonn,easy
%O A015219 0,2
%A A015219 Mohammad K. Azarian (ma3(AT)evansville.edu)
%E A015219 More terms from Erich Friedman (erich.friedman(AT)stetson.edu).

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