Number of nonnegative integer arrays of length 2n+8 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value n+1.
A211853
Number of nonnegative integer arrays of length 2n+8 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value n+1.
Terms
- a(0) =1731a(1) =6936a(2) =21897a(3) =57913a(4) =134164a(5) =280751a(6) =542235a(7) =981675a(8) =1685165a(9) =2766870a(10) =4374561a(11) =6695649a(12) =9963718a(13) =14465557a(14) =20548691a(15) =28629411a(16) =39201303a(17) =52844276a(18) =70234089a(19) =92152377a(20) =119497176a(21) =153293947a(22) =194707099a(23) =245052011a(24) =305807553
External references
- oeis: A211853