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A071938 Binomial(max(n,R(n)),min(n,R(n))) where R(n) is the reversal of n. 1
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; refs; listen; history; text; internal format)
OFFSET
1,10
COMMENTS
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, Jul 14 2005
LINKS
EXAMPLE
a(10) = binomial(10,1) = 10, a(11) = 1, a(12) = binomial(21,12) = 293930.
MAPLE
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, Jul 16 2005
MATHEMATICA
bmm[n_]:=Module[{ir=IntegerReverse[n]}, Binomial[Max[n, ir], Min[n, ir]]]; Array[ bmm, 30] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 13 2020 *)
CROSSREFS
Sequence in context: A280410 A288296 A288020 * A261942 A359734 A057603
KEYWORD
base,nonn
AUTHOR
Joseph L. Pe, Jun 14 2002
EXTENSIONS
Edited by N. J. A. Sloane at the suggestion of Andrew S. Plewe, Jun 23 2007
STATUS
approved

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Last modified May 20 14:08 EDT 2024. Contains 372717 sequences. (Running on oeis4.)