The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A111633 Let n = abc...xyz denote the decimal digits of n. Then a(n) = C(a,z)+C(b,y)+C(c,x)+...+C(x,c)+C(y,b)+C(z,a). 1
 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 2, 3, 6, 10, 15, 21, 28, 36, 1, 3, 3, 2, 4, 10, 20, 35, 56, 84, 1, 4, 6, 4, 2, 5, 15, 35, 70, 126, 1, 5, 10, 10, 5, 2, 6, 21, 56, 126, 1, 6, 15, 20, 15, 6, 2, 7, 28, 84, 1, 7, 21, 35, 35, 21, 7, 2, 8, 36, 1, 8, 28, 56, 70, 56, 28, 8, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,11 LINKS MATHEMATICA f[n_] := Plus @@ Binomial[ IntegerDigits[n], Reverse[ IntegerDigits[ n]]]; Table[ f[n], {n, 88}] CROSSREFS Cf. A111696, A111634. Sequence in context: A157282 A114010 A289188 * A273662 A034138 A254667 Adjacent sequences:  A111630 A111631 A111632 * A111634 A111635 A111636 KEYWORD base,nonn AUTHOR Amarnath Murthy and Robert G. Wilson v, Aug 19 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 27 12:51 EST 2021. Contains 349394 sequences. (Running on oeis4.)