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A074860 a(n) = a(n-1) + R(a(n-2)) + R(a(n-3)) where a(0)=a(1)=a(2)=1 and R(k) = A004086(k) is the reverse of k. 1
1, 1, 1, 3, 5, 9, 17, 31, 111, 195, 319, 1021, 2525, 4639, 11092, 25708, 64083, 173846, 292644, 979061, 2073724, 2680995, 7115676, 17380240, 30136219, 41109707, 136581181, 298634398, 550610143, 1625232666, 2859685613, 9863026929, 19691221772, 32153295043 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
MAPLE
R:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||n):
a:= proc(n) option remember; `if`(n<3, 1,
a(n-1) + R(a(n-2)) + R(a(n-3)))
end:
seq(a(n), n=0..33); # Alois P. Heinz, Jun 17 2021
CROSSREFS
Sequence in context: A114322 A000213 A074858 * A297300 A364543 A213005
KEYWORD
easy,base,nonn
AUTHOR
Felice Russo, Sep 11 2002
EXTENSIONS
Corrected and extended by David Garber, Oct 23 2002
Offset corrected by and more terms from Alois P. Heinz, Jun 17 2021
STATUS
approved

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)