

A096423


a(1)=a(2)=1, a(n) = (a(n1)+1)*(a(n2)+1) for n > 2.


0



1, 1, 4, 10, 55, 616, 34552, 21319201, 736642386706, 15704627843968647814, 11568694537326272321321120595205, 181682042349262169758803442669575561298555791374890
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OFFSET

1,3


COMMENTS

The terms have an interesting factorization pattern, often sharing factors.


LINKS



MATHEMATICA

RecurrenceTable[{a[1]==a[2]==1, a[n]==(a[n1]+1)(a[n2]+1)}, a, {n, 15}] (* Harvey P. Dale, Feb 27 2015 *)


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



