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

Author

Felice Russo, Sep 11 2002

Keywords

• easy
• base
• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..1000
• N. J. A. Sloane, Transforms

Crossrefs

Cf. A000288.

Programs

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;

Extensions

Corrected and extended by David Garber, Oct 23 2002