Generalized Stirling numbers, [n+2,n]_2.

Terms

a(0) =1a(1) =6a(2) =26a(3) =71a(4) =155a(5) =295a(6) =511a(7) =826a(8) =1266a(9) =1860a(10) =2640a(11) =3641a(12) =4901a(13) =6461a(14) =8365a(15) =10660a(16) =13396a(17) =16626a(18) =20406a(19) =24795a(20) =29855a(21) =35651a(22) =42251a(23) =49726a(24) =58150a(25) =67600a(26) =78156a(27) =89901a(28) =102921a(29) =117305