a(1)=1; a(2)=4; for n>2, a(n) = a(n-1) + A000217(n)*a(n-2).
A351046
a(1)=1; a(2)=4; for n>2, a(n) = a(n-1) + A000217(n)*a(n-2).
Terms
- a(0) =1a(1) =4a(2) =10a(3) =50a(4) =200a(5) =1250a(6) =6850a(7) =51850a(8) =360100a(9) =3211850a(10) =26978450a(11) =277502750a(12) =2732541700a(13) =31870330450a(14) =359775334450
External references
- oeis: A351046