a(n) = sigma_2(a(n-1)): 10|a(n>3) ?

Wed May 14 21:42:18 CEST 2008

The first 12 terms are:

2,5,26,850,943950,1318281510000,2755017380686402917800000,1075124144882814594737
7163154256928532205365443200,186653497320711305248493130820948403307540799528422
902350199946673943964748877201760000000000000000,5608979973479962941467879658198
52560098374912733601260863008519515205068370227473944133818904085440315297770330
39880057940151439974043759546565579745013643754183147028817329430538240000000000
000000,5147531289986655715277920512765988278413306649287056392662107751260922442
80496549009931677263986460450706824805541812130271527122633328960243972032065495
59926434963576598623131482865667068082701424503526309081227163680532797617496195
90294900160829386815524077278742345683061637711491615717193581025014427026207955
15722637129698964935086392949434285846253126893016304746687226707968000000000000
0,433860839309335019692065597704620916787752722297618446997076250119165660947177
39332611952735328872233250713183721192955266338119003980527271795640752876932138
26264389364229726839422182778819422593775501126505604147969373168452178531924786
39946224905389788759634433163260759570377533212890934263808692715193586251115459
69545588264423331350225499864304482752487982942700139630354079667839932694892494
10361080014549459327357980089491674324866254573360963965166433328234035566396401
07680372645528266764968878265886591731119058536122689652374843731780050058173377
23482715466265037389777609429649432911040780261685177000880562106582840853176966
52407383059167261347574745980480342345941482477436040531259612533403743541445354
4793149623808329671841741254587265843200000000000000000000000000000000
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