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%I #24 Nov 30 2017 16:20:52
%S 18,21,25,29,33,36,40,42,45,48,52,55
%N Van der Waerden numbers w(j+2; t_0,t_1,...,t_{j-1}, 3, 4) with t_0 = t_1 = ... = t_{j-1} = 2.
%D T. C. Brown, Some new van der Waerden numbers (preliminary report), Notices American Math. Society, 21 (1974), A-432.
%D V. Chvatal, Some unknown van der Waerden numbers, Combinatorial Structures and their Applications (R. Guy et al., eds.), Gordon and Breach, New York, 1970.
%H T. Ahmed, <a href="http://www.emis.de/journals/INTEGERS/papers/j6/j6.Abstract.html">Some new van der Waerden numbers and some van der Waerden-type numbers</a>, Integers, 9 (2009), A06, 65-76.
%H T. Ahmed, <a href="http://www.emis.de/journals/INTEGERS/papers/l71/l71.Abstract.html">On computation of exact van der Waerden numbers</a>, Integers: Electronic Journal of Combinatorial Number Theory, 11 (2011), A71.
%H T. Ahmed, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL16/Ahmed/ahmed2.html">Some more Van der Waerden numbers</a>, J. Int. Seq. 16 (2013) 13.4.4
%e w(2;3,4)=18, w(3;2,3,4)=21, w(4;2,2,3,4)=25, and so on...
%Y Cf. A217005, A217007, A217008, A217059, A217060, A217236, A217237.
%K nonn,more,hard
%O 0,1
%A _Tanbir Ahmed_, Sep 25 2012
%E a(11)=55 added by _Tanbir Ahmed_, Dec 07 2012
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