Search: id:A038255
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%I A038255
%S A038255 1,6,1,36,12,1,216,108,18,1,1296,864,216,24,1,7776,6480,2160,360,
%T A038255 30,1,46656,46656,19440,4320,540,36,1,279936,326592,163296,45360,
%U A038255 7560,756,42,1,1679616,2239488,1306368,435456,90720,12096,1008
%N A038255 Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*1^j.
%C A038255 T(i,j) is the number of i-permutations of 7 objects a,b,c,d,e,f,g, with 
               repetition allowed, containing j a's. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Dec 21 2007
%D A038255 B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal 
               systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 
               109-121.
%D A038255 Naiomi T. Cameron and Asamoah Nkwanta, On Some (Pseudo) Involutions in 
               the Riordan Group, Journal of Integer Sequences, Vol. 8 (2005), Article 
               05.3.7.
%e A038255 1
%e A038255 6, 1
%e A038255 36, 12, 1
%e A038255 216, 108, 18, 1
%e A038255 1296, 864, 216, 24, 1
%e A038255 7776, 6480, 2160, 360, 30, 1
%e A038255 46656, 46656, 19440, 4320, 540, 36, 1
%e A038255 279936, 326592, 163296, 45360, 7560, 756, 42, 1
%e A038255 1679616, 2239488, 1306368, 435456, 90720, 12096, 1008, 48, 1
%p A038255 for i from 0 to 8 do seq(binomial(i, j)*6^(i-j), j = 0 .. i) od; - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Dec 21 2007
%Y A038255 Sequence in context: A030524 A051930 A147320 this_sequence A075501 A089504 
               A145927
%Y A038255 Adjacent sequences: A038252 A038253 A038254 this_sequence A038256 A038257 
               A038258
%K A038255 nonn,tabl,easy
%O A038255 0,2
%A A038255 N. J. A. Sloane (njas(AT)research.att.com).

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