A077746 Group the natural numbers such that the n-th group contains p(n-1) numbers, where p(n-1) is the product of the members of (n-1)-th group, starting with the first group which has one term: (1), (2), (3, 4), (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16), (17, 18, ..., 871782912015, 871782912016), ... Sequence contains the sum of the groups.

1, 2, 7, 168, 380002722841984290048000

Offset

1,2

Comments

a(6) = (871782912016!/16!)[(871782912016!/16!)+1]/2 - 136 is too large to include. - Sam Alexander, Oct 26 2003

Links

Table of n, a(n) for n=1..5.

Crossrefs

Sequence in context: A005345 A174366 A177798 * A236810 A159034 A336249

Adjacent sequences: A077743 A077744 A077745 * A077747 A077748 A077749

Keyword

nonn

Author

Amarnath Murthy, Nov 20 2002

Status

approved