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A174954 a(1)=1 and a(2)=2, a(n) = square of the sum of previous terms. 0
1, 2, 9, 144, 24336, 599858064, 359859080993093136, 129498558604939936508538275302878864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Sqrt(a(n+1)/a(n)) = A082732(n).

LINKS

Table of n, a(n) for n=1..8.

FORMULA

a(n+1) = (Sum_{i=1..n} a(i))^2, for n >= 2 and with a(1)=1, a(2)=2. - Paolo P. Lava, Apr 23 2010

MAPLE

P:=proc(i) local a, s, n; print(1); print(2); s:=3; for n from 0 by 1 to i do a:=s^2; print(a); s:=s+a; od; end: P(100); # Paolo P. Lava, Apr 23 2010

CROSSREFS

Cf. A082732, A174864.

Sequence in context: A189428 A110860 A050995 * A193440 A117116 A211935

Adjacent sequences:  A174951 A174952 A174953 * A174955 A174956 A174957

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Apr 02 2010

STATUS

approved

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Last modified June 6 11:14 EDT 2020. Contains 334827 sequences. (Running on oeis4.)