Binomial transform of binomial(n+2,2).

Terms

a(0) =1a(1) =4a(2) =13a(3) =38a(4) =104a(5) =272a(6) =688a(7) =1696a(8) =4096a(9) =9728a(10) =22784a(11) =52736a(12) =120832a(13) =274432a(14) =618496a(15) =1384448a(16) =3080192a(17) =6815744a(18) =15007744a(19) =32899072a(20) =71827456a(21) =156237824a(22) =338690048a(23) =731906048a(24) =1577058304a(25) =3388997632a(26) =7264534528a(27) =15535702016a(28) =33151778816