Whitney transform of Jacobsthal numbers.

Terms

a(0) =0a(1) =1a(2) =3a(3) =8a(4) =23a(5) =63a(6) =172a(7) =471a(8) =1287a(9) =3516a(10) =9607a(11) =26247a(12) =71708a(13) =195911a(14) =535239a(15) =1462300a(16) =3995079a(17) =10914759a(18) =29819676a(19) =81468871a(20) =222577095a(21) =608091932a(22) =1661338055a(23) =4538859975a(24) =12400396060a(25) =33878512071a(26) =92557816263a(27) =252872656668