A074865 a(n) = a(n-1) + R(a(n-2)) + R(a(n-3)) + R(a(n-4)) where a(1) = a(2) = a(3) = a(4) = 1 and R(n) (A004086) is the reverse of n.

1, 1, 1, 1, 4, 7, 13, 25, 67, 157, 316, 1195, 2635, 9910, 21796, 33268, 108541, 264685, 566431, 1384927, 2251855, 10267813, 23278831, 68031385, 119376340, 223452859, 339327088, 1399568407, 3282220573, 12169858759, 23849465446, 130434244321, 294426858097

Offset

1,5

Links

Table of n, a(n) for n=1..33.

Mathematica

a[1]=a[2]=a[3]=a[4]=1; R[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; a[n_]:=a[n-1]+R[a[n-2]]+R[a[n-3]]+R[a[n-4]]; Array[a, 32] (* Stefano Spezia, Jun 14 2023 *)

Crossrefs

Cf. A000288, A004086.

Sequence in context: A181565 A004119 A074864 * A072683 A304004 A293342

Adjacent sequences: A074862 A074863 A074864 * A074866 A074867 A074868

Keyword

easy,base,nonn

Author

Felice Russo, Sep 11 2002

Extensions

Corrected and extended by Michel ten Voorde Jun 13 2003

More terms from Joshua Zucker, May 08 2006

Definition adapted to offset by Georg Fischer, Jun 18 2021

Status

approved