a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,2,1,1.
A025270
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,2,1,1.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =6a(5) =17a(6) =60a(7) =201a(8) =688a(9) =2370a(10) =8218a(11) =28703a(12) =100846a(13) =356370a(14) =1265918a(15) =4518571a(16) =16200070a(17) =58317298a(18) =210718174a(19) =764015412a(20) =2778955460a(21) =10137598506a(22) =37082361204a(23) =135985402371a(24) =499840932062
External references
- oeis: A025270