OFFSET
1,1
COMMENTS
a(8) is:
699301187738697776955234590818575878858497870436943950335371702267592105356658
849941404678768037675247402565958747959976067293704659262352355225014691708927
778552892641086343071274181444416049073520682688565978919033071721714880653653
080309872598715536025092978123435527211585005389271350498723935289464449420805
795571832413526658955115512510611494293919617563498533091225832128243546205605
992399467856781652450135524637534848361445349052823349129955310671992962375769
922037205735947982909072338647248893042158639365515004077074834659222711212403
575797324146436716175464082981330742529857175516323162599993277609188166949854
918220220568926227236394740277576705068
The sequence continues to grow quite rapidly thereafter.
a(1) = 4 is the smallest meaningful seed for the sequence; if we start with a(1) = 3, the sequence is finite: 3,3,1.
MATHEMATICA
a[1] = 4; a[n_] := a[n] = Binomial[a[n - 1], n - 1];
Table[a[n], {n, 1, 8}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Roger L. Bagula and Gary W. Adamson, Oct 23 2008
EXTENSIONS
Edited by Franklin T. Adams-Watters, Oct 05 2017
STATUS
approved