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A102122 Iccanobirt numbers (12 of 15): a(n) = R(R(a(n-1)) + a(n-2) + a(n-3)), where R is the digit reversal function A004086. 5
0, 0, 1, 1, 2, 4, 7, 31, 42, 26, 531, 302, 67, 909, 8721, 4522, 48811, 72152, 6487, 908821, 844702, 6572211, 9726782, 29139201, 58129562, 86185456, 139627251, 949140792, 656458225, 9962261161, 6171227123, 20114953831, 68392496992 (list; graph; refs; listen; history; internal format)
OFFSET

0,5

COMMENTS

Digit reversal variation of Tribonacci numbers A000073.

Inspired by Iccanobif numbers: A001129, A014258-A014260.

FORMULA

a(n) = A004086(A102114(n)).

MATHEMATICA

R[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Clear[a]; a[0]=0; a[1]=0; a[2]=1; a [n_]:=a[n]=R[R[a[n-1]]+a[n-2]+a[n-3]]; Table[a[n], {n, 0, 40}]

CROSSREFS

Cf. A102111-A102125.

Sequence in context: A102119 A102121 A102120 * A102123 A102125 A102124

Adjacent sequences:  A102119 A102120 A102121 * A102123 A102124 A102125

KEYWORD

nonn,base,easy

AUTHOR

Jonathan Vos Post (jvospost3(AT)gmail.com) and Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 30 2004

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Last modified February 17 16:39 EST 2012. Contains 206058 sequences.