Number of length n+3 0..3 arrays with no disjoint pairs in any consecutive four terms having the same sum.
A247721
Number of length n+3 0..3 arrays with no disjoint pairs in any consecutive four terms having the same sum.
Terms
- a(0) =168a(1) =456a(2) =1248a(3) =3424a(4) =9392a(5) =25822a(6) =71060a(7) =195536a(8) =537880a(9) =1480026a(10) =4073228a(11) =11209522a(12) =30845400a(13) =84880220a(14) =233584180a(15) =642804172a(16) =1768901108a(17) =4867756146a(18) =13395492168a(19) =36862857286a(20) =101441854028a(21) =279154735896a(22) =768198993968
External references
- oeis: A247721