a(0) = 1; for n > 0, a(n) = b(n) - n*b(n-1), b() = A076177().

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =23a(5) =66a(6) =222a(7) =561a(8) =1647a(9) =5410a(10) =14318a(11) =42351a(12) =137018a(13) =372191a(14) =1105275a(15) =3537540a(16) =9772767a(17) =29090826a(18) =92364198a(19) =258208671a(20) =769820418a(21) =2429091885a(22) =6850744365a(23) =20447143866a(24) =64200928194a(25) =182303186391a(26) =544550917797