Small-number statistic from the enumeration of domino tilings of a 5-pillow of order n.

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =13a(5) =29a(6) =34a(7) =100a(8) =130a(9) =305a(10) =361a(11) =881a(12) =1145a(13) =2906a(14) =3557a(15) =8669a(16) =10693a(17) =26893a(18) =33680a(19) =83360a(20) =102800a(21) =254565a(22) =317165a(23) =790037a(24) =980237a(25) =2428298a(26) =3011265a(27) =7483801a(28) =9301217a(29) =23092857