A176299 Variant sequence A169652, with a(1)=1 and a(2)=3.

1, 3, 16, 400, 176400, 31265312400, 977530816165936208400, 955566496615167328821016225384209913664400, 913107329453384594090655605142589591944555936335177523176387250981965992675658480400

Offset

1,2

Comments

Except for first two terms, sqrt(a(n+1)/a(n)) = A144780(n).

Links

Indranil Ghosh, Table of n, a(n) for n = 1..12

Mathematica

a={1, 3}; Do[AppendTo[a, Total[a]^2], {9}]; a (* Indranil Ghosh, Feb 20 2017 *)

Prog

(Python)
#Program to generate the b-file
lst=[1, 3]
print("1 1")
print("2 3")
i=3
a=sum(lst)**2
while i<=12:
    print(str(i)+" "+str(a))
    lst.append(a)
    i+=1
    a=sum(lst)**2 # Indranil Ghosh, Feb 20 2017

Crossrefs

Sequence in context: A224440 A054939 A081782 * A081780 A362382 A297118

Adjacent sequences: A176296 A176297 A176298 * A176300 A176301 A176302

Keyword

nonn

Author

Giovanni Teofilatto, Apr 14 2010

Status

approved