Search: id:A125004
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%I A125004
%S A125004 9,10,11,13,18,30,59,129,299,717,1741,4183,9781,22123,48516,103856,
%T A125004 218683,455839,944616,1950404,4016865,8257883,16962086,34853986,
%U A125004 71735687,148017585,306239910,634872376,1316958592,2728411246
%N A125004 a(0) = 9; for n>0, a(n) is determined by the rule that the concatenation 
               of the leading terms of the difference triangle is the same as the 
               concatenation of the digits of the sequence.
%C A125004 a(0) = 9; binomial transform of sequence gives successive digits of sequence.
%H A125004 N. J. A. Sloane, <a href="transforms.txt">Transforms</a>
%p A125004 revert := proc(n) local Linv,i,L ; L := convert(n,base,10) ; Linv := 
               [] ; for i from 1 to nops(L) do Linv := [op(Linv), op(-i,L)] ; od 
               ; RETURN(Linv) ; end: A125004 := proc(nmax) local ldigs,T,diag,row 
               ; T := array(1..nmax,1..nmax) ; ldigs := [9,1,0] ; T[1,1] := ldigs[1] 
               ; for diag from 2 to nmax do T[diag,1] := ldigs[diag] ; for row from 
               diag-1 to 1 by -1 do T[row,diag-row+1] := T[row,diag-row]+T[row+1,
               diag-row] ; od ; if diag > 2 then ldigs := [op(ldigs), op(revert(T[1,
               diag])) ] ; fi ; od ; RETURN(T) ; end : nmax := 50 : T := A125004(nmax) 
               : for i from 1 to nmax do printf("%d,",T[1,i]) ; od ; - R. J. Mathar 
               (mathar(AT)strw.leidenuniv.nl), Jan 10 2007
%Y A125004 Cf. A125588, A125003, A125591.
%Y A125004 Sequence in context: A031047 A120193 A134534 this_sequence A085514 A086446 
               A045522
%Y A125004 Adjacent sequences: A125001 A125002 A125003 this_sequence A125005 A125006 
               A125007
%K A125004 nonn,easy,base
%O A125004 0,1
%A A125004 N. J. A. Sloane (njas(AT)research.att.com), Jan 08 2007
%E A125004 More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 10 2007

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