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A071938 Binomial(max(n,R(n),min(n,R(n)) where R(n) is the reversal of n. 0
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

Table of n, a(n) for n=1..24.

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

CROSSREFS

Sequence in context: A280410 A288296 A288020 * A261942 A057603 A040097

Adjacent sequences:  A071935 A071936 A071937 * A071939 A071940 A071941

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 June 24 22:08 EDT 2019. Contains 324337 sequences. (Running on oeis4.)