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Search: id:A071938
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| A071938 |
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Binomial(max(n,R(n),min(n,R(n)) where R(n) is the reversal of n. |
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+0
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| 1, 1, 1, 1, 1, 1, 1, 1, 1, 10, 1, 293930, 206253075, 35240152720, 3188675231420, 202802465047245, 10358022441395860, 456703981505085600, 18150420051920130975, 190, 293930, 1, 28048800, 353697121050
(list; graph; listen)
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OFFSET
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1,10
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COMMENT
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a(n) = Binomial(n,reverse(n)) if n >= reverse(n); = Binomial(reverse(n),n) if n < reverse(n).
a(n) = 1 if n is a palindrome. a(n) = n if n = 10^k. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 14 2005
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EXAMPLE
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a(10) = binomial(10,1) = 10, a(11) = 1, a(12) = binomial(21,12) = 293930.
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MAPLE
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R:=proc(n) local nn, nnn: nn:=convert(n, base, 10): add(nn[nops(nn)+1-j]*10^(j-1), j=1..nops(nn)) end: seq(binomial(max(n, R(n)), min(n, R(n))), n=1..27); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 16 2005
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CROSSREFS
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Sequence in context: A131367 A048176 A127616 this_sequence A057603 A040097 A010174
Adjacent sequences: A071935 A071936 A071937 this_sequence A071939 A071940 A071941
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KEYWORD
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base,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jun 14 2002
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EXTENSIONS
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Edited by njas at the suggestion of Andrew Plewe, Jun 23 2007
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