Number of distinct values taken by 7^7^...^7 (with n 7's and parentheses inserted in all possible ways).
A145547
Number of distinct values taken by 7^7^...^7 (with n 7's and parentheses inserted in all possible ways).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =20a(6) =48a(7) =115a(8) =286a(9) =719a(10) =1841a(11) =4762a(12) =12470a(13) =32918a(14) =87628a(15) =234795a(16) =633000a(17) =1715435a(18) =4671098a(19) =12772707a(20) =35059815a(21) =96567161a(22) =266818396a(23) =739344427
External references
- oeis: A145547