Search: id:A139626
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%I A139626
%S A139626 1,30,540,7560,90720,979776,9797760,92378880,831409920,7205552640,
%T A139626 60526642176,495217981440,3961743851520,31084451758080,239794342133760,
%U A139626 1822437000216576,13668277501624320,101306056776744960
%N A139626 Binomial(n+4,4)*6^n.
%C A139626 With a different offset, number of n-permutations (n=5) of 7 objects 
               t, u, v, w, z, x, y with repetition allowed, containing exactly four 
               (4)u's. Example: a(1)=30 because we have
%C A139626 uuuut, uuutu, uutuu, utuuu, tuuuu,
%C A139626 uuuuv, uuuvu, uuvuu, uvuuu, vuuuu,
%C A139626 uuuuw, uuuwu, uuwuu, uwuuu, wuuuu,
%C A139626 uuuuz, uuuzu, uuzuu, uzuuu, zuuuu,
%C A139626 uuuux, uuuxu, uuxuu, uxuuu, xuuuu,
%C A139626 uuuuy, uuuyu, uuyuu, uyuuu, yuuuu.
%p A139626 seq(binomial(n+4,4)*6^n,n=0..22);
%o A139626 (Other) SAGE:[lucas_number2(n, 6, 0)*binomial(n,4)/6^4for n in xrange(4, 
               22)] [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 13 
               2009]
%Y A139626 Sequence in context: A022754 A050982 A004327 this_sequence A037961 A143399 
               A075510
%Y A139626 Adjacent sequences: A139623 A139624 A139625 this_sequence A139627 A139628 
               A139629
%K A139626 nonn
%O A139626 0,2
%A A139626 Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 12 2008

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