a(n) = A349976(n, n-1) for n >= 1 and a(0) = 0.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =2a(5) =8a(6) =10a(7) =25a(8) =49a(9) =93a(10) =187a(11) =377a(12) =747a(13) =1472a(14) =2975a(15) =5911a(16) =11880a(17) =23734a(18) =47474a(19) =94885a(20) =190623a(21) =380805a(22) =763402a(23) =1528095a(24) =3061916a(25) =6125358a(26) =12278446a(27) =24564954a(28) =49200792a(29) =98478615