A074863 a(n) = a(n-1) + a(n-2) + a(n-3) + R(a(n-4)) where a(0)=a(1)=a(2)=a(3)=1 and R(n) (A004086) is the reverse of n.

1, 1, 1, 1, 4, 7, 13, 25, 49, 94, 199, 394, 781, 1423, 3589, 6286, 11485, 24601, 52225, 95137, 230374, 388378, 766114, 1458025, 3085549, 6183571, 11138812, 25616473, 52394659, 90903760, 190798003, 371558074, 748909162, 1317996148, 2739360475, 5277120958

Offset

0,5

Links

Alois P. Heinz, Table of n, a(n) for n = 0..1000

N. J. A. Sloane, Transforms

Maple

read transforms; A074863 := proc(n) option remember; local i, j, k, t1; if n <= 3 then 1 else A074863(n-1)+A074863(n-2)+A074863(n-3) +digrev(A074863(n-4)); fi; end;

Crossrefs

Cf. A000288.

Sequence in context: A229439 A371916 A000288 * A118334 A205538 A181565

Adjacent sequences: A074860 A074861 A074862 * A074864 A074865 A074866

Keyword

easy,base,nonn

Author

Felice Russo, Sep 11 2002

Extensions

Corrected and extended by David Garber, Oct 23 2002

Status

approved