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A109059 To compute a(n) we first write down 7^n 1's in a row. Each row takes the rightmost 7th part of the previous row and each element in it equals sum of the elements of the previous row starting with the first of the rightmost 7th part. The single element in the last row is a(n). 5
1, 1, 7, 322, 102249, 226742516, 3518406903403, 382149784071841422 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..7.

EXAMPLE

For example, for n=3 the array, from 2nd row, follows:

1..2..3.....38..39..40..41..42..43..44..45..46..47..48..49

................................43..87.132.178.225.273.322

.......................................................322

Therefore a(3)=322.

MAPLE

proc(n::nonnegint) local f, a; if n=0 or n=1 then return 1; end if; f:=L->[seq(add(L[i], i=6*nops(L)/7+1..j), j=6*nops(L)/7+1..nops(L))]; a:=f([seq(1, j=1..7^n)]); while nops(a)>7 do a:=f(a) end do; a[7]; end proc;

CROSSREFS

Cf. A107354, A109055, A109056, A109057, A109058, A109060, A109061, A109062.

Sequence in context: A082160 A220278 A163437 * A002000 A092588 A049686

Adjacent sequences:  A109056 A109057 A109058 * A109060 A109061 A109062

KEYWORD

nonn

AUTHOR

Augustine O. Munagi, Jun 17 2005

STATUS

approved

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Last modified July 7 16:09 EDT 2020. Contains 335496 sequences. (Running on oeis4.)