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The a(j) recurrence is a(1)=1 ; a(2)=25 ; a(t+2)=26*a(t+1)-a(t) ;
resulting in a(j) terms A153111
The b(j) recurrence is b(1)=1 ; b(2)=27; b(t+2)=26*b(t+1)-b(t);
resulting in b(j) terms 1,27,701,18199, 472473, 12266099, 318446101 as listed above
The n(j) recurrence is n(1)=0 ; n(2)=104 ; n(3)=675*n(2) ; n(t+3)=675*(n(t+2)-n(t+1)) + n(t) ;
resulting in n(j) terms 0, 104, 70200, 47314800, 31890105104
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