cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A124459 Square array resulting from the bisection of array A124458. (The other array is A093560.)

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%I A124459 #9 Aug 12 2015 02:16:07
%S A124459 2,3,2,3,5,2,3,8,7,2,3,11,15,9,2,3,14,26,24,11,2,3,17,40,50,35,13,2,3,
%T A124459 20,57,90,85,48,15,2,3,23,77,147,175,133,63,17,2,3,26,100,224,322,308,
%U A124459 196,80,19,2,3,29,126,324,546,630,504,276,99,21,2,3,32,155,450,870,1176
%N A124459 Square array resulting from the bisection of array A124458. (The other array is A093560.)
%C A124459 Apparently the same as A029618 if the first term is ignored. - _R. J. Mathar_, Jun 18 2008
%e A124459 Given the square array
%e A124459 1 2 3 3 3 3 3 3 3 3
%e A124459 1 2 4 5 7 8 10 11 13
%e A124459 1 2 5 7 12 15 22 26
%e A124459 1 2 6 9 18 24 40
%e A124459 1 2 7 11 25 35
%e A124459 1 2 8 13 33 (Table A124458)
%e A124459 1 2 9 15
%e A124459 1 2 10
%e A124459 1 2
%e A124459 1
%e A124459 Omit these odd columns:
%e A124459 1 3 3 3 3 3 3 3 3 3 3
%e A124459 1 4 7 10 13 16 19 22 25 28
%e A124459 1 5 12 22 35 51 70 92 117
%e A124459 1 6 18 40 75 126 196 288
%e A124459 1 7 25 65 140 266 462
%e A124459 1 8 33 98 238 504
%e A124459 1 9 42 140 378
%e A124459 1 10 52 192 (Table A093560)
%e A124459 1 11 63
%e A124459 1 12
%e A124459 1
%e A124459 which yields the square array A124459
%p A124459 Reppasc := proc(n,k) binomial(n+floor(k/2),n) ; end: A124458 := proc(n,k) add(Reppasc(n,i), i=max(0,k-3)..k-1) ; end: A124459 := proc(n,k) A124458(n,2*k) ; end: for d from 1 to 19 do for k from d to 1 by -1 do n := d-k ; printf("%d,",A124459(n,k)) ; od: od: # _R. J. Mathar_, Jun 18 2008
%Y A124459 Cf. A084215 (antidiagonal sums).
%K A124459 easy,nonn,tabl
%O A124459 1,1
%A A124459 _Alford Arnold_, Nov 09 2006
%E A124459 More terms from _R. J. Mathar_, Jun 18 2008