First differences of A345882.

Terms

a(0) =1a(1) =3a(2) =6a(3) =19a(4) =34a(5) =114a(6) =204a(7) =376a(8) =609a(9) =2253a(10) =3573a(11) =12514a(12) =21160a(13) =34839a(14) =54311a(15) =209489a(16) =327884a(17) =1157266a(18) =1900261a(19) =3060772a(20) =4760209a(21) =18553192a(22) =28734204a(23) =46515286a(24) =70750097a(25) =106748769a(26) =155242841