A069222 a(1) = a(2) = 1; a(n) = <rev>(a(n-1)) + <rev>(a(n-2)) for n > 2, where <rev>(k) denotes the concatenation of k with its reversal.

1, 1, 22, 2233, 22335544, 2233554466886644, 22335544668866446700441089106644, 2233554466886644670044108910664466995742683267208933773289106644

Offset

1,3

Links

Table of n, a(n) for n=1..8.

Example

a(5) = <>(a(4)) + <>(a(3)) = <>(2233) + <>(22) = 22333322 + 2222= 22335544.

Crossrefs

Sequence in context: A133235 A114449 A069221 * A117990 A098130 A078278

Adjacent sequences: A069219 A069220 A069221 * A069223 A069224 A069225

Keyword

base,nonn

Author

Joseph L. Pe, Apr 12 2002

Status

approved