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A102115
Iccanobirt numbers (5 of 15): a(n) = R(a(n-1)) + a(n-2) + R(a(n-3)), where R is the digit reversal function A004086.
7
0, 0, 1, 1, 2, 4, 7, 13, 42, 44, 117, 779, 1138, 9801, 3204, 22135, 57415, 77633, 144214, 541549, 1123036, 7257201, 3095708, 21636315, 55486847, 104580673, 482935860, 247988412, 1073911003, 3317721397, 9220077878, 15106615327, 89503015162
OFFSET
0,5
COMMENTS
Digit reversal variation of tribonacci numbers A000073.
Inspired by Iccanobif numbers: A001129, A014258-A014260.
LINKS
FORMULA
A004086(a(n)) = A102123(n).
MATHEMATICA
R[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Clear[a]; a[0]=0; a[1]=0; a[2]=1; a [n_]:=a[n]=R[a[n-1]]+a[n-2]+R[a[n-3]]; Table[a[n], {n, 0, 40}]
nxt[{a_, b_, c_}]:={b, c, Total[FromDigits/@Reverse/@IntegerDigits[ {a, c}]]+b}; Transpose[NestList[nxt, {0, 0, 1}, 35]][[1]] (* Harvey P. Dale, Dec 19 2011 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved